Restoring authorship annotation for <orivej@yandex-team.ru>. Commit 1 of 2.

1 files changed, 4779 insertions, 4779 deletions

diff --git a/contrib/libs/llvm12/lib/Bitcode/Writer/BitcodeWriter.cpp b/contrib/libs/llvm12/lib/Bitcode/Writer/BitcodeWriter.cpp
index 37ecb9992e..7019cb6354 100644
--- a/contrib/libs/llvm12/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/contrib/libs/llvm12/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -1,1566 +1,1566 @@
-//===- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// Bitcode writer implementation.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Bitcode/BitcodeWriter.h"
-#include "ValueEnumerator.h"
-#include "llvm/ADT/APFloat.h"
-#include "llvm/ADT/APInt.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/None.h"
-#include "llvm/ADT/Optional.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringMap.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/Triple.h"
+//===- Bitcode/Writer/BitcodeWriter.cpp - Bitcode Writer ------------------===// 
+// 
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 
+// See https://llvm.org/LICENSE.txt for license information. 
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 
+// 
+//===----------------------------------------------------------------------===// 
+// 
+// Bitcode writer implementation. 
+// 
+//===----------------------------------------------------------------------===// 
+ 
+#include "llvm/Bitcode/BitcodeWriter.h" 
+#include "ValueEnumerator.h" 
+#include "llvm/ADT/APFloat.h" 
+#include "llvm/ADT/APInt.h" 
+#include "llvm/ADT/ArrayRef.h" 
+#include "llvm/ADT/DenseMap.h" 
+#include "llvm/ADT/None.h" 
+#include "llvm/ADT/Optional.h" 
+#include "llvm/ADT/STLExtras.h" 
+#include "llvm/ADT/SmallString.h" 
+#include "llvm/ADT/SmallVector.h" 
+#include "llvm/ADT/StringMap.h" 
+#include "llvm/ADT/StringRef.h" 
+#include "llvm/ADT/Triple.h" 
 #include "llvm/Bitcode/BitcodeCommon.h"
-#include "llvm/Bitcode/BitcodeReader.h"
-#include "llvm/Bitcode/LLVMBitCodes.h"
-#include "llvm/Bitstream/BitCodes.h"
-#include "llvm/Bitstream/BitstreamWriter.h"
-#include "llvm/Config/llvm-config.h"
-#include "llvm/IR/Attributes.h"
-#include "llvm/IR/BasicBlock.h"
-#include "llvm/IR/Comdat.h"
-#include "llvm/IR/Constant.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DebugInfoMetadata.h"
-#include "llvm/IR/DebugLoc.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/Function.h"
-#include "llvm/IR/GlobalAlias.h"
-#include "llvm/IR/GlobalIFunc.h"
-#include "llvm/IR/GlobalObject.h"
-#include "llvm/IR/GlobalValue.h"
-#include "llvm/IR/GlobalVariable.h"
-#include "llvm/IR/InlineAsm.h"
-#include "llvm/IR/InstrTypes.h"
-#include "llvm/IR/Instruction.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/Metadata.h"
-#include "llvm/IR/Module.h"
-#include "llvm/IR/ModuleSummaryIndex.h"
-#include "llvm/IR/Operator.h"
-#include "llvm/IR/Type.h"
-#include "llvm/IR/UseListOrder.h"
-#include "llvm/IR/Value.h"
-#include "llvm/IR/ValueSymbolTable.h"
-#include "llvm/MC/StringTableBuilder.h"
-#include "llvm/Object/IRSymtab.h"
-#include "llvm/Support/AtomicOrdering.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Endian.h"
-#include "llvm/Support/Error.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/SHA1.h"
-#include "llvm/Support/TargetRegistry.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <cassert>
-#include <cstddef>
-#include <cstdint>
-#include <iterator>
-#include <map>
-#include <memory>
-#include <string>
-#include <utility>
-#include <vector>
-
-using namespace llvm;
-
-static cl::opt<unsigned>
-    IndexThreshold("bitcode-mdindex-threshold", cl::Hidden, cl::init(25),
-                   cl::desc("Number of metadatas above which we emit an index "
-                            "to enable lazy-loading"));
+#include "llvm/Bitcode/BitcodeReader.h" 
+#include "llvm/Bitcode/LLVMBitCodes.h" 
+#include "llvm/Bitstream/BitCodes.h" 
+#include "llvm/Bitstream/BitstreamWriter.h" 
+#include "llvm/Config/llvm-config.h" 
+#include "llvm/IR/Attributes.h" 
+#include "llvm/IR/BasicBlock.h" 
+#include "llvm/IR/Comdat.h" 
+#include "llvm/IR/Constant.h" 
+#include "llvm/IR/Constants.h" 
+#include "llvm/IR/DebugInfoMetadata.h" 
+#include "llvm/IR/DebugLoc.h" 
+#include "llvm/IR/DerivedTypes.h" 
+#include "llvm/IR/Function.h" 
+#include "llvm/IR/GlobalAlias.h" 
+#include "llvm/IR/GlobalIFunc.h" 
+#include "llvm/IR/GlobalObject.h" 
+#include "llvm/IR/GlobalValue.h" 
+#include "llvm/IR/GlobalVariable.h" 
+#include "llvm/IR/InlineAsm.h" 
+#include "llvm/IR/InstrTypes.h" 
+#include "llvm/IR/Instruction.h" 
+#include "llvm/IR/Instructions.h" 
+#include "llvm/IR/LLVMContext.h" 
+#include "llvm/IR/Metadata.h" 
+#include "llvm/IR/Module.h" 
+#include "llvm/IR/ModuleSummaryIndex.h" 
+#include "llvm/IR/Operator.h" 
+#include "llvm/IR/Type.h" 
+#include "llvm/IR/UseListOrder.h" 
+#include "llvm/IR/Value.h" 
+#include "llvm/IR/ValueSymbolTable.h" 
+#include "llvm/MC/StringTableBuilder.h" 
+#include "llvm/Object/IRSymtab.h" 
+#include "llvm/Support/AtomicOrdering.h" 
+#include "llvm/Support/Casting.h" 
+#include "llvm/Support/CommandLine.h" 
+#include "llvm/Support/Endian.h" 
+#include "llvm/Support/Error.h" 
+#include "llvm/Support/ErrorHandling.h" 
+#include "llvm/Support/MathExtras.h" 
+#include "llvm/Support/SHA1.h" 
+#include "llvm/Support/TargetRegistry.h" 
+#include "llvm/Support/raw_ostream.h" 
+#include <algorithm> 
+#include <cassert> 
+#include <cstddef> 
+#include <cstdint> 
+#include <iterator> 
+#include <map> 
+#include <memory> 
+#include <string> 
+#include <utility> 
+#include <vector> 
+ 
+using namespace llvm; 
+ 
+static cl::opt<unsigned> 
+    IndexThreshold("bitcode-mdindex-threshold", cl::Hidden, cl::init(25), 
+                   cl::desc("Number of metadatas above which we emit an index " 
+                            "to enable lazy-loading")); 
 static cl::opt<uint32_t> FlushThreshold(
     "bitcode-flush-threshold", cl::Hidden, cl::init(512),
     cl::desc("The threshold (unit M) for flushing LLVM bitcode."));
-
-static cl::opt<bool> WriteRelBFToSummary(
-    "write-relbf-to-summary", cl::Hidden, cl::init(false),
-    cl::desc("Write relative block frequency to function summary "));
-
-extern FunctionSummary::ForceSummaryHotnessType ForceSummaryEdgesCold;
-
-namespace {
-
-/// These are manifest constants used by the bitcode writer. They do not need to
-/// be kept in sync with the reader, but need to be consistent within this file.
-enum {
-  // VALUE_SYMTAB_BLOCK abbrev id's.
-  VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
-  VST_ENTRY_7_ABBREV,
-  VST_ENTRY_6_ABBREV,
-  VST_BBENTRY_6_ABBREV,
-
-  // CONSTANTS_BLOCK abbrev id's.
-  CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
-  CONSTANTS_INTEGER_ABBREV,
-  CONSTANTS_CE_CAST_Abbrev,
-  CONSTANTS_NULL_Abbrev,
-
-  // FUNCTION_BLOCK abbrev id's.
-  FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
-  FUNCTION_INST_UNOP_ABBREV,
-  FUNCTION_INST_UNOP_FLAGS_ABBREV,
-  FUNCTION_INST_BINOP_ABBREV,
-  FUNCTION_INST_BINOP_FLAGS_ABBREV,
-  FUNCTION_INST_CAST_ABBREV,
-  FUNCTION_INST_RET_VOID_ABBREV,
-  FUNCTION_INST_RET_VAL_ABBREV,
-  FUNCTION_INST_UNREACHABLE_ABBREV,
-  FUNCTION_INST_GEP_ABBREV,
-};
-
-/// Abstract class to manage the bitcode writing, subclassed for each bitcode
-/// file type.
-class BitcodeWriterBase {
-protected:
-  /// The stream created and owned by the client.
-  BitstreamWriter &Stream;
-
-  StringTableBuilder &StrtabBuilder;
-
-public:
-  /// Constructs a BitcodeWriterBase object that writes to the provided
-  /// \p Stream.
-  BitcodeWriterBase(BitstreamWriter &Stream, StringTableBuilder &StrtabBuilder)
-      : Stream(Stream), StrtabBuilder(StrtabBuilder) {}
-
-protected:
-  void writeBitcodeHeader();
-  void writeModuleVersion();
-};
-
-void BitcodeWriterBase::writeModuleVersion() {
-  // VERSION: [version#]
-  Stream.EmitRecord(bitc::MODULE_CODE_VERSION, ArrayRef<uint64_t>{2});
-}
-
-/// Base class to manage the module bitcode writing, currently subclassed for
-/// ModuleBitcodeWriter and ThinLinkBitcodeWriter.
-class ModuleBitcodeWriterBase : public BitcodeWriterBase {
-protected:
-  /// The Module to write to bitcode.
-  const Module &M;
-
-  /// Enumerates ids for all values in the module.
-  ValueEnumerator VE;
-
-  /// Optional per-module index to write for ThinLTO.
-  const ModuleSummaryIndex *Index;
-
-  /// Map that holds the correspondence between GUIDs in the summary index,
-  /// that came from indirect call profiles, and a value id generated by this
-  /// class to use in the VST and summary block records.
-  std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap;
-
-  /// Tracks the last value id recorded in the GUIDToValueMap.
-  unsigned GlobalValueId;
-
-  /// Saves the offset of the VSTOffset record that must eventually be
-  /// backpatched with the offset of the actual VST.
-  uint64_t VSTOffsetPlaceholder = 0;
-
-public:
-  /// Constructs a ModuleBitcodeWriterBase object for the given Module,
-  /// writing to the provided \p Buffer.
-  ModuleBitcodeWriterBase(const Module &M, StringTableBuilder &StrtabBuilder,
-                          BitstreamWriter &Stream,
-                          bool ShouldPreserveUseListOrder,
-                          const ModuleSummaryIndex *Index)
-      : BitcodeWriterBase(Stream, StrtabBuilder), M(M),
-        VE(M, ShouldPreserveUseListOrder), Index(Index) {
-    // Assign ValueIds to any callee values in the index that came from
-    // indirect call profiles and were recorded as a GUID not a Value*
-    // (which would have been assigned an ID by the ValueEnumerator).
-    // The starting ValueId is just after the number of values in the
-    // ValueEnumerator, so that they can be emitted in the VST.
-    GlobalValueId = VE.getValues().size();
-    if (!Index)
-      return;
-    for (const auto &GUIDSummaryLists : *Index)
-      // Examine all summaries for this GUID.
-      for (auto &Summary : GUIDSummaryLists.second.SummaryList)
-        if (auto FS = dyn_cast<FunctionSummary>(Summary.get()))
-          // For each call in the function summary, see if the call
-          // is to a GUID (which means it is for an indirect call,
-          // otherwise we would have a Value for it). If so, synthesize
-          // a value id.
-          for (auto &CallEdge : FS->calls())
-            if (!CallEdge.first.haveGVs() || !CallEdge.first.getValue())
-              assignValueId(CallEdge.first.getGUID());
-  }
-
-protected:
-  void writePerModuleGlobalValueSummary();
-
-private:
-  void writePerModuleFunctionSummaryRecord(SmallVector<uint64_t, 64> &NameVals,
-                                           GlobalValueSummary *Summary,
-                                           unsigned ValueID,
-                                           unsigned FSCallsAbbrev,
-                                           unsigned FSCallsProfileAbbrev,
-                                           const Function &F);
-  void writeModuleLevelReferences(const GlobalVariable &V,
-                                  SmallVector<uint64_t, 64> &NameVals,
-                                  unsigned FSModRefsAbbrev,
-                                  unsigned FSModVTableRefsAbbrev);
-
-  void assignValueId(GlobalValue::GUID ValGUID) {
-    GUIDToValueIdMap[ValGUID] = ++GlobalValueId;
-  }
-
-  unsigned getValueId(GlobalValue::GUID ValGUID) {
-    const auto &VMI = GUIDToValueIdMap.find(ValGUID);
-    // Expect that any GUID value had a value Id assigned by an
-    // earlier call to assignValueId.
-    assert(VMI != GUIDToValueIdMap.end() &&
-           "GUID does not have assigned value Id");
-    return VMI->second;
-  }
-
-  // Helper to get the valueId for the type of value recorded in VI.
-  unsigned getValueId(ValueInfo VI) {
-    if (!VI.haveGVs() || !VI.getValue())
-      return getValueId(VI.getGUID());
-    return VE.getValueID(VI.getValue());
-  }
-
-  std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; }
-};
-
-/// Class to manage the bitcode writing for a module.
-class ModuleBitcodeWriter : public ModuleBitcodeWriterBase {
-  /// Pointer to the buffer allocated by caller for bitcode writing.
-  const SmallVectorImpl<char> &Buffer;
-
-  /// True if a module hash record should be written.
-  bool GenerateHash;
-
-  /// If non-null, when GenerateHash is true, the resulting hash is written
-  /// into ModHash.
-  ModuleHash *ModHash;
-
-  SHA1 Hasher;
-
-  /// The start bit of the identification block.
-  uint64_t BitcodeStartBit;
-
-public:
-  /// Constructs a ModuleBitcodeWriter object for the given Module,
-  /// writing to the provided \p Buffer.
-  ModuleBitcodeWriter(const Module &M, SmallVectorImpl<char> &Buffer,
-                      StringTableBuilder &StrtabBuilder,
-                      BitstreamWriter &Stream, bool ShouldPreserveUseListOrder,
-                      const ModuleSummaryIndex *Index, bool GenerateHash,
-                      ModuleHash *ModHash = nullptr)
-      : ModuleBitcodeWriterBase(M, StrtabBuilder, Stream,
-                                ShouldPreserveUseListOrder, Index),
-        Buffer(Buffer), GenerateHash(GenerateHash), ModHash(ModHash),
-        BitcodeStartBit(Stream.GetCurrentBitNo()) {}
-
-  /// Emit the current module to the bitstream.
-  void write();
-
-private:
-  uint64_t bitcodeStartBit() { return BitcodeStartBit; }
-
-  size_t addToStrtab(StringRef Str);
-
-  void writeAttributeGroupTable();
-  void writeAttributeTable();
-  void writeTypeTable();
-  void writeComdats();
-  void writeValueSymbolTableForwardDecl();
-  void writeModuleInfo();
-  void writeValueAsMetadata(const ValueAsMetadata *MD,
-                            SmallVectorImpl<uint64_t> &Record);
-  void writeMDTuple(const MDTuple *N, SmallVectorImpl<uint64_t> &Record,
-                    unsigned Abbrev);
-  unsigned createDILocationAbbrev();
-  void writeDILocation(const DILocation *N, SmallVectorImpl<uint64_t> &Record,
-                       unsigned &Abbrev);
-  unsigned createGenericDINodeAbbrev();
-  void writeGenericDINode(const GenericDINode *N,
-                          SmallVectorImpl<uint64_t> &Record, unsigned &Abbrev);
-  void writeDISubrange(const DISubrange *N, SmallVectorImpl<uint64_t> &Record,
-                       unsigned Abbrev);
+ 
+static cl::opt<bool> WriteRelBFToSummary( 
+    "write-relbf-to-summary", cl::Hidden, cl::init(false), 
+    cl::desc("Write relative block frequency to function summary ")); 
+ 
+extern FunctionSummary::ForceSummaryHotnessType ForceSummaryEdgesCold; 
+ 
+namespace { 
+ 
+/// These are manifest constants used by the bitcode writer. They do not need to 
+/// be kept in sync with the reader, but need to be consistent within this file. 
+enum { 
+  // VALUE_SYMTAB_BLOCK abbrev id's. 
+  VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 
+  VST_ENTRY_7_ABBREV, 
+  VST_ENTRY_6_ABBREV, 
+  VST_BBENTRY_6_ABBREV, 
+ 
+  // CONSTANTS_BLOCK abbrev id's. 
+  CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 
+  CONSTANTS_INTEGER_ABBREV, 
+  CONSTANTS_CE_CAST_Abbrev, 
+  CONSTANTS_NULL_Abbrev, 
+ 
+  // FUNCTION_BLOCK abbrev id's. 
+  FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV, 
+  FUNCTION_INST_UNOP_ABBREV, 
+  FUNCTION_INST_UNOP_FLAGS_ABBREV, 
+  FUNCTION_INST_BINOP_ABBREV, 
+  FUNCTION_INST_BINOP_FLAGS_ABBREV, 
+  FUNCTION_INST_CAST_ABBREV, 
+  FUNCTION_INST_RET_VOID_ABBREV, 
+  FUNCTION_INST_RET_VAL_ABBREV, 
+  FUNCTION_INST_UNREACHABLE_ABBREV, 
+  FUNCTION_INST_GEP_ABBREV, 
+}; 
+ 
+/// Abstract class to manage the bitcode writing, subclassed for each bitcode 
+/// file type. 
+class BitcodeWriterBase { 
+protected: 
+  /// The stream created and owned by the client. 
+  BitstreamWriter &Stream; 
+ 
+  StringTableBuilder &StrtabBuilder; 
+ 
+public: 
+  /// Constructs a BitcodeWriterBase object that writes to the provided 
+  /// \p Stream. 
+  BitcodeWriterBase(BitstreamWriter &Stream, StringTableBuilder &StrtabBuilder) 
+      : Stream(Stream), StrtabBuilder(StrtabBuilder) {} 
+ 
+protected: 
+  void writeBitcodeHeader(); 
+  void writeModuleVersion(); 
+}; 
+ 
+void BitcodeWriterBase::writeModuleVersion() { 
+  // VERSION: [version#] 
+  Stream.EmitRecord(bitc::MODULE_CODE_VERSION, ArrayRef<uint64_t>{2}); 
+} 
+ 
+/// Base class to manage the module bitcode writing, currently subclassed for 
+/// ModuleBitcodeWriter and ThinLinkBitcodeWriter. 
+class ModuleBitcodeWriterBase : public BitcodeWriterBase { 
+protected: 
+  /// The Module to write to bitcode. 
+  const Module &M; 
+ 
+  /// Enumerates ids for all values in the module. 
+  ValueEnumerator VE; 
+ 
+  /// Optional per-module index to write for ThinLTO. 
+  const ModuleSummaryIndex *Index; 
+ 
+  /// Map that holds the correspondence between GUIDs in the summary index, 
+  /// that came from indirect call profiles, and a value id generated by this 
+  /// class to use in the VST and summary block records. 
+  std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap; 
+ 
+  /// Tracks the last value id recorded in the GUIDToValueMap. 
+  unsigned GlobalValueId; 
+ 
+  /// Saves the offset of the VSTOffset record that must eventually be 
+  /// backpatched with the offset of the actual VST. 
+  uint64_t VSTOffsetPlaceholder = 0; 
+ 
+public: 
+  /// Constructs a ModuleBitcodeWriterBase object for the given Module, 
+  /// writing to the provided \p Buffer. 
+  ModuleBitcodeWriterBase(const Module &M, StringTableBuilder &StrtabBuilder, 
+                          BitstreamWriter &Stream, 
+                          bool ShouldPreserveUseListOrder, 
+                          const ModuleSummaryIndex *Index) 
+      : BitcodeWriterBase(Stream, StrtabBuilder), M(M), 
+        VE(M, ShouldPreserveUseListOrder), Index(Index) { 
+    // Assign ValueIds to any callee values in the index that came from 
+    // indirect call profiles and were recorded as a GUID not a Value* 
+    // (which would have been assigned an ID by the ValueEnumerator). 
+    // The starting ValueId is just after the number of values in the 
+    // ValueEnumerator, so that they can be emitted in the VST. 
+    GlobalValueId = VE.getValues().size(); 
+    if (!Index) 
+      return; 
+    for (const auto &GUIDSummaryLists : *Index) 
+      // Examine all summaries for this GUID. 
+      for (auto &Summary : GUIDSummaryLists.second.SummaryList) 
+        if (auto FS = dyn_cast<FunctionSummary>(Summary.get())) 
+          // For each call in the function summary, see if the call 
+          // is to a GUID (which means it is for an indirect call, 
+          // otherwise we would have a Value for it). If so, synthesize 
+          // a value id. 
+          for (auto &CallEdge : FS->calls()) 
+            if (!CallEdge.first.haveGVs() || !CallEdge.first.getValue()) 
+              assignValueId(CallEdge.first.getGUID()); 
+  } 
+ 
+protected: 
+  void writePerModuleGlobalValueSummary(); 
+ 
+private: 
+  void writePerModuleFunctionSummaryRecord(SmallVector<uint64_t, 64> &NameVals, 
+                                           GlobalValueSummary *Summary, 
+                                           unsigned ValueID, 
+                                           unsigned FSCallsAbbrev, 
+                                           unsigned FSCallsProfileAbbrev, 
+                                           const Function &F); 
+  void writeModuleLevelReferences(const GlobalVariable &V, 
+                                  SmallVector<uint64_t, 64> &NameVals, 
+                                  unsigned FSModRefsAbbrev, 
+                                  unsigned FSModVTableRefsAbbrev); 
+ 
+  void assignValueId(GlobalValue::GUID ValGUID) { 
+    GUIDToValueIdMap[ValGUID] = ++GlobalValueId; 
+  } 
+ 
+  unsigned getValueId(GlobalValue::GUID ValGUID) { 
+    const auto &VMI = GUIDToValueIdMap.find(ValGUID); 
+    // Expect that any GUID value had a value Id assigned by an 
+    // earlier call to assignValueId. 
+    assert(VMI != GUIDToValueIdMap.end() && 
+           "GUID does not have assigned value Id"); 
+    return VMI->second; 
+  } 
+ 
+  // Helper to get the valueId for the type of value recorded in VI. 
+  unsigned getValueId(ValueInfo VI) { 
+    if (!VI.haveGVs() || !VI.getValue()) 
+      return getValueId(VI.getGUID()); 
+    return VE.getValueID(VI.getValue()); 
+  } 
+ 
+  std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; } 
+}; 
+ 
+/// Class to manage the bitcode writing for a module. 
+class ModuleBitcodeWriter : public ModuleBitcodeWriterBase { 
+  /// Pointer to the buffer allocated by caller for bitcode writing. 
+  const SmallVectorImpl<char> &Buffer; 
+ 
+  /// True if a module hash record should be written. 
+  bool GenerateHash; 
+ 
+  /// If non-null, when GenerateHash is true, the resulting hash is written 
+  /// into ModHash. 
+  ModuleHash *ModHash; 
+ 
+  SHA1 Hasher; 
+ 
+  /// The start bit of the identification block. 
+  uint64_t BitcodeStartBit; 
+ 
+public: 
+  /// Constructs a ModuleBitcodeWriter object for the given Module, 
+  /// writing to the provided \p Buffer. 
+  ModuleBitcodeWriter(const Module &M, SmallVectorImpl<char> &Buffer, 
+                      StringTableBuilder &StrtabBuilder, 
+                      BitstreamWriter &Stream, bool ShouldPreserveUseListOrder, 
+                      const ModuleSummaryIndex *Index, bool GenerateHash, 
+                      ModuleHash *ModHash = nullptr) 
+      : ModuleBitcodeWriterBase(M, StrtabBuilder, Stream, 
+                                ShouldPreserveUseListOrder, Index), 
+        Buffer(Buffer), GenerateHash(GenerateHash), ModHash(ModHash), 
+        BitcodeStartBit(Stream.GetCurrentBitNo()) {} 
+ 
+  /// Emit the current module to the bitstream. 
+  void write(); 
+ 
+private: 
+  uint64_t bitcodeStartBit() { return BitcodeStartBit; } 
+ 
+  size_t addToStrtab(StringRef Str); 
+ 
+  void writeAttributeGroupTable(); 
+  void writeAttributeTable(); 
+  void writeTypeTable(); 
+  void writeComdats(); 
+  void writeValueSymbolTableForwardDecl(); 
+  void writeModuleInfo(); 
+  void writeValueAsMetadata(const ValueAsMetadata *MD, 
+                            SmallVectorImpl<uint64_t> &Record); 
+  void writeMDTuple(const MDTuple *N, SmallVectorImpl<uint64_t> &Record, 
+                    unsigned Abbrev); 
+  unsigned createDILocationAbbrev(); 
+  void writeDILocation(const DILocation *N, SmallVectorImpl<uint64_t> &Record, 
+                       unsigned &Abbrev); 
+  unsigned createGenericDINodeAbbrev(); 
+  void writeGenericDINode(const GenericDINode *N, 
+                          SmallVectorImpl<uint64_t> &Record, unsigned &Abbrev); 
+  void writeDISubrange(const DISubrange *N, SmallVectorImpl<uint64_t> &Record, 
+                       unsigned Abbrev); 
   void writeDIGenericSubrange(const DIGenericSubrange *N,
                               SmallVectorImpl<uint64_t> &Record,
                               unsigned Abbrev);
-  void writeDIEnumerator(const DIEnumerator *N,
-                         SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDIBasicType(const DIBasicType *N, SmallVectorImpl<uint64_t> &Record,
-                        unsigned Abbrev);
+  void writeDIEnumerator(const DIEnumerator *N, 
+                         SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDIBasicType(const DIBasicType *N, SmallVectorImpl<uint64_t> &Record, 
+                        unsigned Abbrev); 
   void writeDIStringType(const DIStringType *N,
                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDIDerivedType(const DIDerivedType *N,
-                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDICompositeType(const DICompositeType *N,
-                            SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDISubroutineType(const DISubroutineType *N,
-                             SmallVectorImpl<uint64_t> &Record,
-                             unsigned Abbrev);
-  void writeDIFile(const DIFile *N, SmallVectorImpl<uint64_t> &Record,
-                   unsigned Abbrev);
-  void writeDICompileUnit(const DICompileUnit *N,
-                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDISubprogram(const DISubprogram *N,
-                         SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDILexicalBlock(const DILexicalBlock *N,
-                           SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDILexicalBlockFile(const DILexicalBlockFile *N,
-                               SmallVectorImpl<uint64_t> &Record,
-                               unsigned Abbrev);
-  void writeDICommonBlock(const DICommonBlock *N,
-                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDINamespace(const DINamespace *N, SmallVectorImpl<uint64_t> &Record,
-                        unsigned Abbrev);
-  void writeDIMacro(const DIMacro *N, SmallVectorImpl<uint64_t> &Record,
-                    unsigned Abbrev);
-  void writeDIMacroFile(const DIMacroFile *N, SmallVectorImpl<uint64_t> &Record,
-                        unsigned Abbrev);
-  void writeDIModule(const DIModule *N, SmallVectorImpl<uint64_t> &Record,
-                     unsigned Abbrev);
-  void writeDITemplateTypeParameter(const DITemplateTypeParameter *N,
-                                    SmallVectorImpl<uint64_t> &Record,
-                                    unsigned Abbrev);
-  void writeDITemplateValueParameter(const DITemplateValueParameter *N,
-                                     SmallVectorImpl<uint64_t> &Record,
-                                     unsigned Abbrev);
-  void writeDIGlobalVariable(const DIGlobalVariable *N,
-                             SmallVectorImpl<uint64_t> &Record,
-                             unsigned Abbrev);
-  void writeDILocalVariable(const DILocalVariable *N,
-                            SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDILabel(const DILabel *N,
-                    SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDIExpression(const DIExpression *N,
-                         SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDIGlobalVariableExpression(const DIGlobalVariableExpression *N,
-                                       SmallVectorImpl<uint64_t> &Record,
-                                       unsigned Abbrev);
-  void writeDIObjCProperty(const DIObjCProperty *N,
-                           SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
-  void writeDIImportedEntity(const DIImportedEntity *N,
-                             SmallVectorImpl<uint64_t> &Record,
-                             unsigned Abbrev);
-  unsigned createNamedMetadataAbbrev();
-  void writeNamedMetadata(SmallVectorImpl<uint64_t> &Record);
-  unsigned createMetadataStringsAbbrev();
-  void writeMetadataStrings(ArrayRef<const Metadata *> Strings,
-                            SmallVectorImpl<uint64_t> &Record);
-  void writeMetadataRecords(ArrayRef<const Metadata *> MDs,
-                            SmallVectorImpl<uint64_t> &Record,
-                            std::vector<unsigned> *MDAbbrevs = nullptr,
-                            std::vector<uint64_t> *IndexPos = nullptr);
-  void writeModuleMetadata();
-  void writeFunctionMetadata(const Function &F);
-  void writeFunctionMetadataAttachment(const Function &F);
-  void writeGlobalVariableMetadataAttachment(const GlobalVariable &GV);
-  void pushGlobalMetadataAttachment(SmallVectorImpl<uint64_t> &Record,
-                                    const GlobalObject &GO);
-  void writeModuleMetadataKinds();
-  void writeOperandBundleTags();
-  void writeSyncScopeNames();
-  void writeConstants(unsigned FirstVal, unsigned LastVal, bool isGlobal);
-  void writeModuleConstants();
-  bool pushValueAndType(const Value *V, unsigned InstID,
-                        SmallVectorImpl<unsigned> &Vals);
-  void writeOperandBundles(const CallBase &CB, unsigned InstID);
-  void pushValue(const Value *V, unsigned InstID,
-                 SmallVectorImpl<unsigned> &Vals);
-  void pushValueSigned(const Value *V, unsigned InstID,
-                       SmallVectorImpl<uint64_t> &Vals);
-  void writeInstruction(const Instruction &I, unsigned InstID,
-                        SmallVectorImpl<unsigned> &Vals);
-  void writeFunctionLevelValueSymbolTable(const ValueSymbolTable &VST);
-  void writeGlobalValueSymbolTable(
-      DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex);
-  void writeUseList(UseListOrder &&Order);
-  void writeUseListBlock(const Function *F);
-  void
-  writeFunction(const Function &F,
-                DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex);
-  void writeBlockInfo();
-  void writeModuleHash(size_t BlockStartPos);
-
-  unsigned getEncodedSyncScopeID(SyncScope::ID SSID) {
-    return unsigned(SSID);
-  }
+  void writeDIDerivedType(const DIDerivedType *N, 
+                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDICompositeType(const DICompositeType *N, 
+                            SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDISubroutineType(const DISubroutineType *N, 
+                             SmallVectorImpl<uint64_t> &Record, 
+                             unsigned Abbrev); 
+  void writeDIFile(const DIFile *N, SmallVectorImpl<uint64_t> &Record, 
+                   unsigned Abbrev); 
+  void writeDICompileUnit(const DICompileUnit *N, 
+                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDISubprogram(const DISubprogram *N, 
+                         SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDILexicalBlock(const DILexicalBlock *N, 
+                           SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDILexicalBlockFile(const DILexicalBlockFile *N, 
+                               SmallVectorImpl<uint64_t> &Record, 
+                               unsigned Abbrev); 
+  void writeDICommonBlock(const DICommonBlock *N, 
+                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDINamespace(const DINamespace *N, SmallVectorImpl<uint64_t> &Record, 
+                        unsigned Abbrev); 
+  void writeDIMacro(const DIMacro *N, SmallVectorImpl<uint64_t> &Record, 
+                    unsigned Abbrev); 
+  void writeDIMacroFile(const DIMacroFile *N, SmallVectorImpl<uint64_t> &Record, 
+                        unsigned Abbrev); 
+  void writeDIModule(const DIModule *N, SmallVectorImpl<uint64_t> &Record, 
+                     unsigned Abbrev); 
+  void writeDITemplateTypeParameter(const DITemplateTypeParameter *N, 
+                                    SmallVectorImpl<uint64_t> &Record, 
+                                    unsigned Abbrev); 
+  void writeDITemplateValueParameter(const DITemplateValueParameter *N, 
+                                     SmallVectorImpl<uint64_t> &Record, 
+                                     unsigned Abbrev); 
+  void writeDIGlobalVariable(const DIGlobalVariable *N, 
+                             SmallVectorImpl<uint64_t> &Record, 
+                             unsigned Abbrev); 
+  void writeDILocalVariable(const DILocalVariable *N, 
+                            SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDILabel(const DILabel *N, 
+                    SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDIExpression(const DIExpression *N, 
+                         SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDIGlobalVariableExpression(const DIGlobalVariableExpression *N, 
+                                       SmallVectorImpl<uint64_t> &Record, 
+                                       unsigned Abbrev); 
+  void writeDIObjCProperty(const DIObjCProperty *N, 
+                           SmallVectorImpl<uint64_t> &Record, unsigned Abbrev); 
+  void writeDIImportedEntity(const DIImportedEntity *N, 
+                             SmallVectorImpl<uint64_t> &Record, 
+                             unsigned Abbrev); 
+  unsigned createNamedMetadataAbbrev(); 
+  void writeNamedMetadata(SmallVectorImpl<uint64_t> &Record); 
+  unsigned createMetadataStringsAbbrev(); 
+  void writeMetadataStrings(ArrayRef<const Metadata *> Strings, 
+                            SmallVectorImpl<uint64_t> &Record); 
+  void writeMetadataRecords(ArrayRef<const Metadata *> MDs, 
+                            SmallVectorImpl<uint64_t> &Record, 
+                            std::vector<unsigned> *MDAbbrevs = nullptr, 
+                            std::vector<uint64_t> *IndexPos = nullptr); 
+  void writeModuleMetadata(); 
+  void writeFunctionMetadata(const Function &F); 
+  void writeFunctionMetadataAttachment(const Function &F); 
+  void writeGlobalVariableMetadataAttachment(const GlobalVariable &GV); 
+  void pushGlobalMetadataAttachment(SmallVectorImpl<uint64_t> &Record, 
+                                    const GlobalObject &GO); 
+  void writeModuleMetadataKinds(); 
+  void writeOperandBundleTags(); 
+  void writeSyncScopeNames(); 
+  void writeConstants(unsigned FirstVal, unsigned LastVal, bool isGlobal); 
+  void writeModuleConstants(); 
+  bool pushValueAndType(const Value *V, unsigned InstID, 
+                        SmallVectorImpl<unsigned> &Vals); 
+  void writeOperandBundles(const CallBase &CB, unsigned InstID); 
+  void pushValue(const Value *V, unsigned InstID, 
+                 SmallVectorImpl<unsigned> &Vals); 
+  void pushValueSigned(const Value *V, unsigned InstID, 
+                       SmallVectorImpl<uint64_t> &Vals); 
+  void writeInstruction(const Instruction &I, unsigned InstID, 
+                        SmallVectorImpl<unsigned> &Vals); 
+  void writeFunctionLevelValueSymbolTable(const ValueSymbolTable &VST); 
+  void writeGlobalValueSymbolTable( 
+      DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex); 
+  void writeUseList(UseListOrder &&Order); 
+  void writeUseListBlock(const Function *F); 
+  void 
+  writeFunction(const Function &F, 
+                DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex); 
+  void writeBlockInfo(); 
+  void writeModuleHash(size_t BlockStartPos); 
+ 
+  unsigned getEncodedSyncScopeID(SyncScope::ID SSID) { 
+    return unsigned(SSID); 
+  } 
 
   unsigned getEncodedAlign(MaybeAlign Alignment) { return encode(Alignment); }
-};
-
-/// Class to manage the bitcode writing for a combined index.
-class IndexBitcodeWriter : public BitcodeWriterBase {
-  /// The combined index to write to bitcode.
-  const ModuleSummaryIndex &Index;
-
-  /// When writing a subset of the index for distributed backends, client
-  /// provides a map of modules to the corresponding GUIDs/summaries to write.
-  const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex;
-
-  /// Map that holds the correspondence between the GUID used in the combined
-  /// index and a value id generated by this class to use in references.
-  std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap;
-
-  /// Tracks the last value id recorded in the GUIDToValueMap.
-  unsigned GlobalValueId = 0;
-
-public:
-  /// Constructs a IndexBitcodeWriter object for the given combined index,
-  /// writing to the provided \p Buffer. When writing a subset of the index
-  /// for a distributed backend, provide a \p ModuleToSummariesForIndex map.
-  IndexBitcodeWriter(BitstreamWriter &Stream, StringTableBuilder &StrtabBuilder,
-                     const ModuleSummaryIndex &Index,
-                     const std::map<std::string, GVSummaryMapTy>
-                         *ModuleToSummariesForIndex = nullptr)
-      : BitcodeWriterBase(Stream, StrtabBuilder), Index(Index),
-        ModuleToSummariesForIndex(ModuleToSummariesForIndex) {
-    // Assign unique value ids to all summaries to be written, for use
-    // in writing out the call graph edges. Save the mapping from GUID
-    // to the new global value id to use when writing those edges, which
-    // are currently saved in the index in terms of GUID.
-    forEachSummary([&](GVInfo I, bool) {
-      GUIDToValueIdMap[I.first] = ++GlobalValueId;
-    });
-  }
-
-  /// The below iterator returns the GUID and associated summary.
-  using GVInfo = std::pair<GlobalValue::GUID, GlobalValueSummary *>;
-
-  /// Calls the callback for each value GUID and summary to be written to
-  /// bitcode. This hides the details of whether they are being pulled from the
-  /// entire index or just those in a provided ModuleToSummariesForIndex map.
-  template<typename Functor>
-  void forEachSummary(Functor Callback) {
-    if (ModuleToSummariesForIndex) {
-      for (auto &M : *ModuleToSummariesForIndex)
-        for (auto &Summary : M.second) {
-          Callback(Summary, false);
-          // Ensure aliasee is handled, e.g. for assigning a valueId,
-          // even if we are not importing the aliasee directly (the
-          // imported alias will contain a copy of aliasee).
-          if (auto *AS = dyn_cast<AliasSummary>(Summary.getSecond()))
-            Callback({AS->getAliaseeGUID(), &AS->getAliasee()}, true);
-        }
-    } else {
-      for (auto &Summaries : Index)
-        for (auto &Summary : Summaries.second.SummaryList)
-          Callback({Summaries.first, Summary.get()}, false);
-    }
-  }
-
-  /// Calls the callback for each entry in the modulePaths StringMap that
-  /// should be written to the module path string table. This hides the details
-  /// of whether they are being pulled from the entire index or just those in a
-  /// provided ModuleToSummariesForIndex map.
-  template <typename Functor> void forEachModule(Functor Callback) {
-    if (ModuleToSummariesForIndex) {
-      for (const auto &M : *ModuleToSummariesForIndex) {
-        const auto &MPI = Index.modulePaths().find(M.first);
-        if (MPI == Index.modulePaths().end()) {
-          // This should only happen if the bitcode file was empty, in which
-          // case we shouldn't be importing (the ModuleToSummariesForIndex
-          // would only include the module we are writing and index for).
-          assert(ModuleToSummariesForIndex->size() == 1);
-          continue;
-        }
-        Callback(*MPI);
-      }
-    } else {
-      for (const auto &MPSE : Index.modulePaths())
-        Callback(MPSE);
-    }
-  }
-
-  /// Main entry point for writing a combined index to bitcode.
-  void write();
-
-private:
-  void writeModStrings();
-  void writeCombinedGlobalValueSummary();
-
-  Optional<unsigned> getValueId(GlobalValue::GUID ValGUID) {
-    auto VMI = GUIDToValueIdMap.find(ValGUID);
-    if (VMI == GUIDToValueIdMap.end())
-      return None;
-    return VMI->second;
-  }
-
-  std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; }
-};
-
-} // end anonymous namespace
-
-static unsigned getEncodedCastOpcode(unsigned Opcode) {
-  switch (Opcode) {
-  default: llvm_unreachable("Unknown cast instruction!");
-  case Instruction::Trunc   : return bitc::CAST_TRUNC;
-  case Instruction::ZExt    : return bitc::CAST_ZEXT;
-  case Instruction::SExt    : return bitc::CAST_SEXT;
-  case Instruction::FPToUI  : return bitc::CAST_FPTOUI;
-  case Instruction::FPToSI  : return bitc::CAST_FPTOSI;
-  case Instruction::UIToFP  : return bitc::CAST_UITOFP;
-  case Instruction::SIToFP  : return bitc::CAST_SITOFP;
-  case Instruction::FPTrunc : return bitc::CAST_FPTRUNC;
-  case Instruction::FPExt   : return bitc::CAST_FPEXT;
-  case Instruction::PtrToInt: return bitc::CAST_PTRTOINT;
-  case Instruction::IntToPtr: return bitc::CAST_INTTOPTR;
-  case Instruction::BitCast : return bitc::CAST_BITCAST;
-  case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST;
-  }
-}
-
-static unsigned getEncodedUnaryOpcode(unsigned Opcode) {
-  switch (Opcode) {
-  default: llvm_unreachable("Unknown binary instruction!");
-  case Instruction::FNeg: return bitc::UNOP_FNEG;
-  }
-}
-
-static unsigned getEncodedBinaryOpcode(unsigned Opcode) {
-  switch (Opcode) {
-  default: llvm_unreachable("Unknown binary instruction!");
-  case Instruction::Add:
-  case Instruction::FAdd: return bitc::BINOP_ADD;
-  case Instruction::Sub:
-  case Instruction::FSub: return bitc::BINOP_SUB;
-  case Instruction::Mul:
-  case Instruction::FMul: return bitc::BINOP_MUL;
-  case Instruction::UDiv: return bitc::BINOP_UDIV;
-  case Instruction::FDiv:
-  case Instruction::SDiv: return bitc::BINOP_SDIV;
-  case Instruction::URem: return bitc::BINOP_UREM;
-  case Instruction::FRem:
-  case Instruction::SRem: return bitc::BINOP_SREM;
-  case Instruction::Shl:  return bitc::BINOP_SHL;
-  case Instruction::LShr: return bitc::BINOP_LSHR;
-  case Instruction::AShr: return bitc::BINOP_ASHR;
-  case Instruction::And:  return bitc::BINOP_AND;
-  case Instruction::Or:   return bitc::BINOP_OR;
-  case Instruction::Xor:  return bitc::BINOP_XOR;
-  }
-}
-
-static unsigned getEncodedRMWOperation(AtomicRMWInst::BinOp Op) {
-  switch (Op) {
-  default: llvm_unreachable("Unknown RMW operation!");
-  case AtomicRMWInst::Xchg: return bitc::RMW_XCHG;
-  case AtomicRMWInst::Add: return bitc::RMW_ADD;
-  case AtomicRMWInst::Sub: return bitc::RMW_SUB;
-  case AtomicRMWInst::And: return bitc::RMW_AND;
-  case AtomicRMWInst::Nand: return bitc::RMW_NAND;
-  case AtomicRMWInst::Or: return bitc::RMW_OR;
-  case AtomicRMWInst::Xor: return bitc::RMW_XOR;
-  case AtomicRMWInst::Max: return bitc::RMW_MAX;
-  case AtomicRMWInst::Min: return bitc::RMW_MIN;
-  case AtomicRMWInst::UMax: return bitc::RMW_UMAX;
-  case AtomicRMWInst::UMin: return bitc::RMW_UMIN;
-  case AtomicRMWInst::FAdd: return bitc::RMW_FADD;
-  case AtomicRMWInst::FSub: return bitc::RMW_FSUB;
-  }
-}
-
-static unsigned getEncodedOrdering(AtomicOrdering Ordering) {
-  switch (Ordering) {
-  case AtomicOrdering::NotAtomic: return bitc::ORDERING_NOTATOMIC;
-  case AtomicOrdering::Unordered: return bitc::ORDERING_UNORDERED;
-  case AtomicOrdering::Monotonic: return bitc::ORDERING_MONOTONIC;
-  case AtomicOrdering::Acquire: return bitc::ORDERING_ACQUIRE;
-  case AtomicOrdering::Release: return bitc::ORDERING_RELEASE;
-  case AtomicOrdering::AcquireRelease: return bitc::ORDERING_ACQREL;
-  case AtomicOrdering::SequentiallyConsistent: return bitc::ORDERING_SEQCST;
-  }
-  llvm_unreachable("Invalid ordering");
-}
-
-static void writeStringRecord(BitstreamWriter &Stream, unsigned Code,
-                              StringRef Str, unsigned AbbrevToUse) {
-  SmallVector<unsigned, 64> Vals;
-
-  // Code: [strchar x N]
-  for (unsigned i = 0, e = Str.size(); i != e; ++i) {
-    if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i]))
-      AbbrevToUse = 0;
-    Vals.push_back(Str[i]);
-  }
-
-  // Emit the finished record.
-  Stream.EmitRecord(Code, Vals, AbbrevToUse);
-}
-
-static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
-  switch (Kind) {
-  case Attribute::Alignment:
-    return bitc::ATTR_KIND_ALIGNMENT;
-  case Attribute::AllocSize:
-    return bitc::ATTR_KIND_ALLOC_SIZE;
-  case Attribute::AlwaysInline:
-    return bitc::ATTR_KIND_ALWAYS_INLINE;
-  case Attribute::ArgMemOnly:
-    return bitc::ATTR_KIND_ARGMEMONLY;
-  case Attribute::Builtin:
-    return bitc::ATTR_KIND_BUILTIN;
-  case Attribute::ByVal:
-    return bitc::ATTR_KIND_BY_VAL;
-  case Attribute::Convergent:
-    return bitc::ATTR_KIND_CONVERGENT;
-  case Attribute::InAlloca:
-    return bitc::ATTR_KIND_IN_ALLOCA;
-  case Attribute::Cold:
-    return bitc::ATTR_KIND_COLD;
+}; 
+ 
+/// Class to manage the bitcode writing for a combined index. 
+class IndexBitcodeWriter : public BitcodeWriterBase { 
+  /// The combined index to write to bitcode. 
+  const ModuleSummaryIndex &Index; 
+ 
+  /// When writing a subset of the index for distributed backends, client 
+  /// provides a map of modules to the corresponding GUIDs/summaries to write. 
+  const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex; 
+ 
+  /// Map that holds the correspondence between the GUID used in the combined 
+  /// index and a value id generated by this class to use in references. 
+  std::map<GlobalValue::GUID, unsigned> GUIDToValueIdMap; 
+ 
+  /// Tracks the last value id recorded in the GUIDToValueMap. 
+  unsigned GlobalValueId = 0; 
+ 
+public: 
+  /// Constructs a IndexBitcodeWriter object for the given combined index, 
+  /// writing to the provided \p Buffer. When writing a subset of the index 
+  /// for a distributed backend, provide a \p ModuleToSummariesForIndex map. 
+  IndexBitcodeWriter(BitstreamWriter &Stream, StringTableBuilder &StrtabBuilder, 
+                     const ModuleSummaryIndex &Index, 
+                     const std::map<std::string, GVSummaryMapTy> 
+                         *ModuleToSummariesForIndex = nullptr) 
+      : BitcodeWriterBase(Stream, StrtabBuilder), Index(Index), 
+        ModuleToSummariesForIndex(ModuleToSummariesForIndex) { 
+    // Assign unique value ids to all summaries to be written, for use 
+    // in writing out the call graph edges. Save the mapping from GUID 
+    // to the new global value id to use when writing those edges, which 
+    // are currently saved in the index in terms of GUID. 
+    forEachSummary([&](GVInfo I, bool) { 
+      GUIDToValueIdMap[I.first] = ++GlobalValueId; 
+    }); 
+  } 
+ 
+  /// The below iterator returns the GUID and associated summary. 
+  using GVInfo = std::pair<GlobalValue::GUID, GlobalValueSummary *>; 
+ 
+  /// Calls the callback for each value GUID and summary to be written to 
+  /// bitcode. This hides the details of whether they are being pulled from the 
+  /// entire index or just those in a provided ModuleToSummariesForIndex map. 
+  template<typename Functor> 
+  void forEachSummary(Functor Callback) { 
+    if (ModuleToSummariesForIndex) { 
+      for (auto &M : *ModuleToSummariesForIndex) 
+        for (auto &Summary : M.second) { 
+          Callback(Summary, false); 
+          // Ensure aliasee is handled, e.g. for assigning a valueId, 
+          // even if we are not importing the aliasee directly (the 
+          // imported alias will contain a copy of aliasee). 
+          if (auto *AS = dyn_cast<AliasSummary>(Summary.getSecond())) 
+            Callback({AS->getAliaseeGUID(), &AS->getAliasee()}, true); 
+        } 
+    } else { 
+      for (auto &Summaries : Index) 
+        for (auto &Summary : Summaries.second.SummaryList) 
+          Callback({Summaries.first, Summary.get()}, false); 
+    } 
+  } 
+ 
+  /// Calls the callback for each entry in the modulePaths StringMap that 
+  /// should be written to the module path string table. This hides the details 
+  /// of whether they are being pulled from the entire index or just those in a 
+  /// provided ModuleToSummariesForIndex map. 
+  template <typename Functor> void forEachModule(Functor Callback) { 
+    if (ModuleToSummariesForIndex) { 
+      for (const auto &M : *ModuleToSummariesForIndex) { 
+        const auto &MPI = Index.modulePaths().find(M.first); 
+        if (MPI == Index.modulePaths().end()) { 
+          // This should only happen if the bitcode file was empty, in which 
+          // case we shouldn't be importing (the ModuleToSummariesForIndex 
+          // would only include the module we are writing and index for). 
+          assert(ModuleToSummariesForIndex->size() == 1); 
+          continue; 
+        } 
+        Callback(*MPI); 
+      } 
+    } else { 
+      for (const auto &MPSE : Index.modulePaths()) 
+        Callback(MPSE); 
+    } 
+  } 
+ 
+  /// Main entry point for writing a combined index to bitcode. 
+  void write(); 
+ 
+private: 
+  void writeModStrings(); 
+  void writeCombinedGlobalValueSummary(); 
+ 
+  Optional<unsigned> getValueId(GlobalValue::GUID ValGUID) { 
+    auto VMI = GUIDToValueIdMap.find(ValGUID); 
+    if (VMI == GUIDToValueIdMap.end()) 
+      return None; 
+    return VMI->second; 
+  } 
+ 
+  std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; } 
+}; 
+ 
+} // end anonymous namespace 
+ 
+static unsigned getEncodedCastOpcode(unsigned Opcode) { 
+  switch (Opcode) { 
+  default: llvm_unreachable("Unknown cast instruction!"); 
+  case Instruction::Trunc   : return bitc::CAST_TRUNC; 
+  case Instruction::ZExt    : return bitc::CAST_ZEXT; 
+  case Instruction::SExt    : return bitc::CAST_SEXT; 
+  case Instruction::FPToUI  : return bitc::CAST_FPTOUI; 
+  case Instruction::FPToSI  : return bitc::CAST_FPTOSI; 
+  case Instruction::UIToFP  : return bitc::CAST_UITOFP; 
+  case Instruction::SIToFP  : return bitc::CAST_SITOFP; 
+  case Instruction::FPTrunc : return bitc::CAST_FPTRUNC; 
+  case Instruction::FPExt   : return bitc::CAST_FPEXT; 
+  case Instruction::PtrToInt: return bitc::CAST_PTRTOINT; 
+  case Instruction::IntToPtr: return bitc::CAST_INTTOPTR; 
+  case Instruction::BitCast : return bitc::CAST_BITCAST; 
+  case Instruction::AddrSpaceCast: return bitc::CAST_ADDRSPACECAST; 
+  } 
+} 
+ 
+static unsigned getEncodedUnaryOpcode(unsigned Opcode) { 
+  switch (Opcode) { 
+  default: llvm_unreachable("Unknown binary instruction!"); 
+  case Instruction::FNeg: return bitc::UNOP_FNEG; 
+  } 
+} 
+ 
+static unsigned getEncodedBinaryOpcode(unsigned Opcode) { 
+  switch (Opcode) { 
+  default: llvm_unreachable("Unknown binary instruction!"); 
+  case Instruction::Add: 
+  case Instruction::FAdd: return bitc::BINOP_ADD; 
+  case Instruction::Sub: 
+  case Instruction::FSub: return bitc::BINOP_SUB; 
+  case Instruction::Mul: 
+  case Instruction::FMul: return bitc::BINOP_MUL; 
+  case Instruction::UDiv: return bitc::BINOP_UDIV; 
+  case Instruction::FDiv: 
+  case Instruction::SDiv: return bitc::BINOP_SDIV; 
+  case Instruction::URem: return bitc::BINOP_UREM; 
+  case Instruction::FRem: 
+  case Instruction::SRem: return bitc::BINOP_SREM; 
+  case Instruction::Shl:  return bitc::BINOP_SHL; 
+  case Instruction::LShr: return bitc::BINOP_LSHR; 
+  case Instruction::AShr: return bitc::BINOP_ASHR; 
+  case Instruction::And:  return bitc::BINOP_AND; 
+  case Instruction::Or:   return bitc::BINOP_OR; 
+  case Instruction::Xor:  return bitc::BINOP_XOR; 
+  } 
+} 
+ 
+static unsigned getEncodedRMWOperation(AtomicRMWInst::BinOp Op) { 
+  switch (Op) { 
+  default: llvm_unreachable("Unknown RMW operation!"); 
+  case AtomicRMWInst::Xchg: return bitc::RMW_XCHG; 
+  case AtomicRMWInst::Add: return bitc::RMW_ADD; 
+  case AtomicRMWInst::Sub: return bitc::RMW_SUB; 
+  case AtomicRMWInst::And: return bitc::RMW_AND; 
+  case AtomicRMWInst::Nand: return bitc::RMW_NAND; 
+  case AtomicRMWInst::Or: return bitc::RMW_OR; 
+  case AtomicRMWInst::Xor: return bitc::RMW_XOR; 
+  case AtomicRMWInst::Max: return bitc::RMW_MAX; 
+  case AtomicRMWInst::Min: return bitc::RMW_MIN; 
+  case AtomicRMWInst::UMax: return bitc::RMW_UMAX; 
+  case AtomicRMWInst::UMin: return bitc::RMW_UMIN; 
+  case AtomicRMWInst::FAdd: return bitc::RMW_FADD; 
+  case AtomicRMWInst::FSub: return bitc::RMW_FSUB; 
+  } 
+} 
+ 
+static unsigned getEncodedOrdering(AtomicOrdering Ordering) { 
+  switch (Ordering) { 
+  case AtomicOrdering::NotAtomic: return bitc::ORDERING_NOTATOMIC; 
+  case AtomicOrdering::Unordered: return bitc::ORDERING_UNORDERED; 
+  case AtomicOrdering::Monotonic: return bitc::ORDERING_MONOTONIC; 
+  case AtomicOrdering::Acquire: return bitc::ORDERING_ACQUIRE; 
+  case AtomicOrdering::Release: return bitc::ORDERING_RELEASE; 
+  case AtomicOrdering::AcquireRelease: return bitc::ORDERING_ACQREL; 
+  case AtomicOrdering::SequentiallyConsistent: return bitc::ORDERING_SEQCST; 
+  } 
+  llvm_unreachable("Invalid ordering"); 
+} 
+ 
+static void writeStringRecord(BitstreamWriter &Stream, unsigned Code, 
+                              StringRef Str, unsigned AbbrevToUse) { 
+  SmallVector<unsigned, 64> Vals; 
+ 
+  // Code: [strchar x N] 
+  for (unsigned i = 0, e = Str.size(); i != e; ++i) { 
+    if (AbbrevToUse && !BitCodeAbbrevOp::isChar6(Str[i])) 
+      AbbrevToUse = 0; 
+    Vals.push_back(Str[i]); 
+  } 
+ 
+  // Emit the finished record. 
+  Stream.EmitRecord(Code, Vals, AbbrevToUse); 
+} 
+ 
+static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) { 
+  switch (Kind) { 
+  case Attribute::Alignment: 
+    return bitc::ATTR_KIND_ALIGNMENT; 
+  case Attribute::AllocSize: 
+    return bitc::ATTR_KIND_ALLOC_SIZE; 
+  case Attribute::AlwaysInline: 
+    return bitc::ATTR_KIND_ALWAYS_INLINE; 
+  case Attribute::ArgMemOnly: 
+    return bitc::ATTR_KIND_ARGMEMONLY; 
+  case Attribute::Builtin: 
+    return bitc::ATTR_KIND_BUILTIN; 
+  case Attribute::ByVal: 
+    return bitc::ATTR_KIND_BY_VAL; 
+  case Attribute::Convergent: 
+    return bitc::ATTR_KIND_CONVERGENT; 
+  case Attribute::InAlloca: 
+    return bitc::ATTR_KIND_IN_ALLOCA; 
+  case Attribute::Cold: 
+    return bitc::ATTR_KIND_COLD; 
   case Attribute::Hot:
     return bitc::ATTR_KIND_HOT;
-  case Attribute::InaccessibleMemOnly:
-    return bitc::ATTR_KIND_INACCESSIBLEMEM_ONLY;
-  case Attribute::InaccessibleMemOrArgMemOnly:
-    return bitc::ATTR_KIND_INACCESSIBLEMEM_OR_ARGMEMONLY;
-  case Attribute::InlineHint:
-    return bitc::ATTR_KIND_INLINE_HINT;
-  case Attribute::InReg:
-    return bitc::ATTR_KIND_IN_REG;
-  case Attribute::JumpTable:
-    return bitc::ATTR_KIND_JUMP_TABLE;
-  case Attribute::MinSize:
-    return bitc::ATTR_KIND_MIN_SIZE;
-  case Attribute::Naked:
-    return bitc::ATTR_KIND_NAKED;
-  case Attribute::Nest:
-    return bitc::ATTR_KIND_NEST;
-  case Attribute::NoAlias:
-    return bitc::ATTR_KIND_NO_ALIAS;
-  case Attribute::NoBuiltin:
-    return bitc::ATTR_KIND_NO_BUILTIN;
+  case Attribute::InaccessibleMemOnly: 
+    return bitc::ATTR_KIND_INACCESSIBLEMEM_ONLY; 
+  case Attribute::InaccessibleMemOrArgMemOnly: 
+    return bitc::ATTR_KIND_INACCESSIBLEMEM_OR_ARGMEMONLY; 
+  case Attribute::InlineHint: 
+    return bitc::ATTR_KIND_INLINE_HINT; 
+  case Attribute::InReg: 
+    return bitc::ATTR_KIND_IN_REG; 
+  case Attribute::JumpTable: 
+    return bitc::ATTR_KIND_JUMP_TABLE; 
+  case Attribute::MinSize: 
+    return bitc::ATTR_KIND_MIN_SIZE; 
+  case Attribute::Naked: 
+    return bitc::ATTR_KIND_NAKED; 
+  case Attribute::Nest: 
+    return bitc::ATTR_KIND_NEST; 
+  case Attribute::NoAlias: 
+    return bitc::ATTR_KIND_NO_ALIAS; 
+  case Attribute::NoBuiltin: 
+    return bitc::ATTR_KIND_NO_BUILTIN; 
   case Attribute::NoCallback:
     return bitc::ATTR_KIND_NO_CALLBACK;
-  case Attribute::NoCapture:
-    return bitc::ATTR_KIND_NO_CAPTURE;
-  case Attribute::NoDuplicate:
-    return bitc::ATTR_KIND_NO_DUPLICATE;
-  case Attribute::NoFree:
-    return bitc::ATTR_KIND_NOFREE;
-  case Attribute::NoImplicitFloat:
-    return bitc::ATTR_KIND_NO_IMPLICIT_FLOAT;
-  case Attribute::NoInline:
-    return bitc::ATTR_KIND_NO_INLINE;
-  case Attribute::NoRecurse:
-    return bitc::ATTR_KIND_NO_RECURSE;
-  case Attribute::NoMerge:
-    return bitc::ATTR_KIND_NO_MERGE;
-  case Attribute::NonLazyBind:
-    return bitc::ATTR_KIND_NON_LAZY_BIND;
-  case Attribute::NonNull:
-    return bitc::ATTR_KIND_NON_NULL;
-  case Attribute::Dereferenceable:
-    return bitc::ATTR_KIND_DEREFERENCEABLE;
-  case Attribute::DereferenceableOrNull:
-    return bitc::ATTR_KIND_DEREFERENCEABLE_OR_NULL;
-  case Attribute::NoRedZone:
-    return bitc::ATTR_KIND_NO_RED_ZONE;
-  case Attribute::NoReturn:
-    return bitc::ATTR_KIND_NO_RETURN;
-  case Attribute::NoSync:
-    return bitc::ATTR_KIND_NOSYNC;
-  case Attribute::NoCfCheck:
-    return bitc::ATTR_KIND_NOCF_CHECK;
+  case Attribute::NoCapture: 
+    return bitc::ATTR_KIND_NO_CAPTURE; 
+  case Attribute::NoDuplicate: 
+    return bitc::ATTR_KIND_NO_DUPLICATE; 
+  case Attribute::NoFree: 
+    return bitc::ATTR_KIND_NOFREE; 
+  case Attribute::NoImplicitFloat: 
+    return bitc::ATTR_KIND_NO_IMPLICIT_FLOAT; 
+  case Attribute::NoInline: 
+    return bitc::ATTR_KIND_NO_INLINE; 
+  case Attribute::NoRecurse: 
+    return bitc::ATTR_KIND_NO_RECURSE; 
+  case Attribute::NoMerge: 
+    return bitc::ATTR_KIND_NO_MERGE; 
+  case Attribute::NonLazyBind: 
+    return bitc::ATTR_KIND_NON_LAZY_BIND; 
+  case Attribute::NonNull: 
+    return bitc::ATTR_KIND_NON_NULL; 
+  case Attribute::Dereferenceable: 
+    return bitc::ATTR_KIND_DEREFERENCEABLE; 
+  case Attribute::DereferenceableOrNull: 
+    return bitc::ATTR_KIND_DEREFERENCEABLE_OR_NULL; 
+  case Attribute::NoRedZone: 
+    return bitc::ATTR_KIND_NO_RED_ZONE; 
+  case Attribute::NoReturn: 
+    return bitc::ATTR_KIND_NO_RETURN; 
+  case Attribute::NoSync: 
+    return bitc::ATTR_KIND_NOSYNC; 
+  case Attribute::NoCfCheck: 
+    return bitc::ATTR_KIND_NOCF_CHECK; 
   case Attribute::NoProfile:
     return bitc::ATTR_KIND_NO_PROFILE;
-  case Attribute::NoUnwind:
-    return bitc::ATTR_KIND_NO_UNWIND;
-  case Attribute::NullPointerIsValid:
-    return bitc::ATTR_KIND_NULL_POINTER_IS_VALID;
-  case Attribute::OptForFuzzing:
-    return bitc::ATTR_KIND_OPT_FOR_FUZZING;
-  case Attribute::OptimizeForSize:
-    return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE;
-  case Attribute::OptimizeNone:
-    return bitc::ATTR_KIND_OPTIMIZE_NONE;
-  case Attribute::ReadNone:
-    return bitc::ATTR_KIND_READ_NONE;
-  case Attribute::ReadOnly:
-    return bitc::ATTR_KIND_READ_ONLY;
-  case Attribute::Returned:
-    return bitc::ATTR_KIND_RETURNED;
-  case Attribute::ReturnsTwice:
-    return bitc::ATTR_KIND_RETURNS_TWICE;
-  case Attribute::SExt:
-    return bitc::ATTR_KIND_S_EXT;
-  case Attribute::Speculatable:
-    return bitc::ATTR_KIND_SPECULATABLE;
-  case Attribute::StackAlignment:
-    return bitc::ATTR_KIND_STACK_ALIGNMENT;
-  case Attribute::StackProtect:
-    return bitc::ATTR_KIND_STACK_PROTECT;
-  case Attribute::StackProtectReq:
-    return bitc::ATTR_KIND_STACK_PROTECT_REQ;
-  case Attribute::StackProtectStrong:
-    return bitc::ATTR_KIND_STACK_PROTECT_STRONG;
-  case Attribute::SafeStack:
-    return bitc::ATTR_KIND_SAFESTACK;
-  case Attribute::ShadowCallStack:
-    return bitc::ATTR_KIND_SHADOWCALLSTACK;
-  case Attribute::StrictFP:
-    return bitc::ATTR_KIND_STRICT_FP;
-  case Attribute::StructRet:
-    return bitc::ATTR_KIND_STRUCT_RET;
-  case Attribute::SanitizeAddress:
-    return bitc::ATTR_KIND_SANITIZE_ADDRESS;
-  case Attribute::SanitizeHWAddress:
-    return bitc::ATTR_KIND_SANITIZE_HWADDRESS;
-  case Attribute::SanitizeThread:
-    return bitc::ATTR_KIND_SANITIZE_THREAD;
-  case Attribute::SanitizeMemory:
-    return bitc::ATTR_KIND_SANITIZE_MEMORY;
-  case Attribute::SpeculativeLoadHardening:
-    return bitc::ATTR_KIND_SPECULATIVE_LOAD_HARDENING;
-  case Attribute::SwiftError:
-    return bitc::ATTR_KIND_SWIFT_ERROR;
-  case Attribute::SwiftSelf:
-    return bitc::ATTR_KIND_SWIFT_SELF;
-  case Attribute::UWTable:
-    return bitc::ATTR_KIND_UW_TABLE;
-  case Attribute::WillReturn:
-    return bitc::ATTR_KIND_WILLRETURN;
-  case Attribute::WriteOnly:
-    return bitc::ATTR_KIND_WRITEONLY;
-  case Attribute::ZExt:
-    return bitc::ATTR_KIND_Z_EXT;
-  case Attribute::ImmArg:
-    return bitc::ATTR_KIND_IMMARG;
-  case Attribute::SanitizeMemTag:
-    return bitc::ATTR_KIND_SANITIZE_MEMTAG;
-  case Attribute::Preallocated:
-    return bitc::ATTR_KIND_PREALLOCATED;
-  case Attribute::NoUndef:
-    return bitc::ATTR_KIND_NOUNDEF;
+  case Attribute::NoUnwind: 
+    return bitc::ATTR_KIND_NO_UNWIND; 
+  case Attribute::NullPointerIsValid: 
+    return bitc::ATTR_KIND_NULL_POINTER_IS_VALID; 
+  case Attribute::OptForFuzzing: 
+    return bitc::ATTR_KIND_OPT_FOR_FUZZING; 
+  case Attribute::OptimizeForSize: 
+    return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE; 
+  case Attribute::OptimizeNone: 
+    return bitc::ATTR_KIND_OPTIMIZE_NONE; 
+  case Attribute::ReadNone: 
+    return bitc::ATTR_KIND_READ_NONE; 
+  case Attribute::ReadOnly: 
+    return bitc::ATTR_KIND_READ_ONLY; 
+  case Attribute::Returned: 
+    return bitc::ATTR_KIND_RETURNED; 
+  case Attribute::ReturnsTwice: 
+    return bitc::ATTR_KIND_RETURNS_TWICE; 
+  case Attribute::SExt: 
+    return bitc::ATTR_KIND_S_EXT; 
+  case Attribute::Speculatable: 
+    return bitc::ATTR_KIND_SPECULATABLE; 
+  case Attribute::StackAlignment: 
+    return bitc::ATTR_KIND_STACK_ALIGNMENT; 
+  case Attribute::StackProtect: 
+    return bitc::ATTR_KIND_STACK_PROTECT; 
+  case Attribute::StackProtectReq: 
+    return bitc::ATTR_KIND_STACK_PROTECT_REQ; 
+  case Attribute::StackProtectStrong: 
+    return bitc::ATTR_KIND_STACK_PROTECT_STRONG; 
+  case Attribute::SafeStack: 
+    return bitc::ATTR_KIND_SAFESTACK; 
+  case Attribute::ShadowCallStack: 
+    return bitc::ATTR_KIND_SHADOWCALLSTACK; 
+  case Attribute::StrictFP: 
+    return bitc::ATTR_KIND_STRICT_FP; 
+  case Attribute::StructRet: 
+    return bitc::ATTR_KIND_STRUCT_RET; 
+  case Attribute::SanitizeAddress: 
+    return bitc::ATTR_KIND_SANITIZE_ADDRESS; 
+  case Attribute::SanitizeHWAddress: 
+    return bitc::ATTR_KIND_SANITIZE_HWADDRESS; 
+  case Attribute::SanitizeThread: 
+    return bitc::ATTR_KIND_SANITIZE_THREAD; 
+  case Attribute::SanitizeMemory: 
+    return bitc::ATTR_KIND_SANITIZE_MEMORY; 
+  case Attribute::SpeculativeLoadHardening: 
+    return bitc::ATTR_KIND_SPECULATIVE_LOAD_HARDENING; 
+  case Attribute::SwiftError: 
+    return bitc::ATTR_KIND_SWIFT_ERROR; 
+  case Attribute::SwiftSelf: 
+    return bitc::ATTR_KIND_SWIFT_SELF; 
+  case Attribute::UWTable: 
+    return bitc::ATTR_KIND_UW_TABLE; 
+  case Attribute::WillReturn: 
+    return bitc::ATTR_KIND_WILLRETURN; 
+  case Attribute::WriteOnly: 
+    return bitc::ATTR_KIND_WRITEONLY; 
+  case Attribute::ZExt: 
+    return bitc::ATTR_KIND_Z_EXT; 
+  case Attribute::ImmArg: 
+    return bitc::ATTR_KIND_IMMARG; 
+  case Attribute::SanitizeMemTag: 
+    return bitc::ATTR_KIND_SANITIZE_MEMTAG; 
+  case Attribute::Preallocated: 
+    return bitc::ATTR_KIND_PREALLOCATED; 
+  case Attribute::NoUndef: 
+    return bitc::ATTR_KIND_NOUNDEF; 
   case Attribute::ByRef:
     return bitc::ATTR_KIND_BYREF;
   case Attribute::MustProgress:
     return bitc::ATTR_KIND_MUSTPROGRESS;
-  case Attribute::EndAttrKinds:
-    llvm_unreachable("Can not encode end-attribute kinds marker.");
-  case Attribute::None:
-    llvm_unreachable("Can not encode none-attribute.");
-  case Attribute::EmptyKey:
-  case Attribute::TombstoneKey:
-    llvm_unreachable("Trying to encode EmptyKey/TombstoneKey");
-  }
-
-  llvm_unreachable("Trying to encode unknown attribute");
-}
-
-void ModuleBitcodeWriter::writeAttributeGroupTable() {
-  const std::vector<ValueEnumerator::IndexAndAttrSet> &AttrGrps =
-      VE.getAttributeGroups();
-  if (AttrGrps.empty()) return;
-
-  Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3);
-
-  SmallVector<uint64_t, 64> Record;
-  for (ValueEnumerator::IndexAndAttrSet Pair : AttrGrps) {
-    unsigned AttrListIndex = Pair.first;
-    AttributeSet AS = Pair.second;
-    Record.push_back(VE.getAttributeGroupID(Pair));
-    Record.push_back(AttrListIndex);
-
-    for (Attribute Attr : AS) {
-      if (Attr.isEnumAttribute()) {
-        Record.push_back(0);
-        Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
-      } else if (Attr.isIntAttribute()) {
-        Record.push_back(1);
-        Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
-        Record.push_back(Attr.getValueAsInt());
-      } else if (Attr.isStringAttribute()) {
-        StringRef Kind = Attr.getKindAsString();
-        StringRef Val = Attr.getValueAsString();
-
-        Record.push_back(Val.empty() ? 3 : 4);
-        Record.append(Kind.begin(), Kind.end());
-        Record.push_back(0);
-        if (!Val.empty()) {
-          Record.append(Val.begin(), Val.end());
-          Record.push_back(0);
-        }
-      } else {
-        assert(Attr.isTypeAttribute());
-        Type *Ty = Attr.getValueAsType();
-        Record.push_back(Ty ? 6 : 5);
-        Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum()));
-        if (Ty)
-          Record.push_back(VE.getTypeID(Attr.getValueAsType()));
-      }
-    }
-
-    Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record);
-    Record.clear();
-  }
-
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::writeAttributeTable() {
-  const std::vector<AttributeList> &Attrs = VE.getAttributeLists();
-  if (Attrs.empty()) return;
-
-  Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
-
-  SmallVector<uint64_t, 64> Record;
-  for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
-    AttributeList AL = Attrs[i];
-    for (unsigned i = AL.index_begin(), e = AL.index_end(); i != e; ++i) {
-      AttributeSet AS = AL.getAttributes(i);
-      if (AS.hasAttributes())
-        Record.push_back(VE.getAttributeGroupID({i, AS}));
-    }
-
-    Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
-    Record.clear();
-  }
-
-  Stream.ExitBlock();
-}
-
-/// WriteTypeTable - Write out the type table for a module.
-void ModuleBitcodeWriter::writeTypeTable() {
-  const ValueEnumerator::TypeList &TypeList = VE.getTypes();
-
-  Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */);
-  SmallVector<uint64_t, 64> TypeVals;
-
-  uint64_t NumBits = VE.computeBitsRequiredForTypeIndicies();
-
-  // Abbrev for TYPE_CODE_POINTER.
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
-  Abbv->Add(BitCodeAbbrevOp(0));  // Addrspace = 0
-  unsigned PtrAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for TYPE_CODE_FUNCTION.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));  // isvararg
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
-  unsigned FunctionAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for TYPE_CODE_STRUCT_ANON.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));  // ispacked
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
-  unsigned StructAnonAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for TYPE_CODE_STRUCT_NAME.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-  unsigned StructNameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for TYPE_CODE_STRUCT_NAMED.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));  // ispacked
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
-  unsigned StructNamedAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for TYPE_CODE_ARRAY.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // size
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
-  unsigned ArrayAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Emit an entry count so the reader can reserve space.
-  TypeVals.push_back(TypeList.size());
-  Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
-  TypeVals.clear();
-
-  // Loop over all of the types, emitting each in turn.
-  for (unsigned i = 0, e = TypeList.size(); i != e; ++i) {
-    Type *T = TypeList[i];
-    int AbbrevToUse = 0;
-    unsigned Code = 0;
-
-    switch (T->getTypeID()) {
-    case Type::VoidTyID:      Code = bitc::TYPE_CODE_VOID;      break;
-    case Type::HalfTyID:      Code = bitc::TYPE_CODE_HALF;      break;
-    case Type::BFloatTyID:    Code = bitc::TYPE_CODE_BFLOAT;    break;
-    case Type::FloatTyID:     Code = bitc::TYPE_CODE_FLOAT;     break;
-    case Type::DoubleTyID:    Code = bitc::TYPE_CODE_DOUBLE;    break;
-    case Type::X86_FP80TyID:  Code = bitc::TYPE_CODE_X86_FP80;  break;
-    case Type::FP128TyID:     Code = bitc::TYPE_CODE_FP128;     break;
-    case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break;
-    case Type::LabelTyID:     Code = bitc::TYPE_CODE_LABEL;     break;
-    case Type::MetadataTyID:  Code = bitc::TYPE_CODE_METADATA;  break;
-    case Type::X86_MMXTyID:   Code = bitc::TYPE_CODE_X86_MMX;   break;
+  case Attribute::EndAttrKinds: 
+    llvm_unreachable("Can not encode end-attribute kinds marker."); 
+  case Attribute::None: 
+    llvm_unreachable("Can not encode none-attribute."); 
+  case Attribute::EmptyKey: 
+  case Attribute::TombstoneKey: 
+    llvm_unreachable("Trying to encode EmptyKey/TombstoneKey"); 
+  } 
+ 
+  llvm_unreachable("Trying to encode unknown attribute"); 
+} 
+ 
+void ModuleBitcodeWriter::writeAttributeGroupTable() { 
+  const std::vector<ValueEnumerator::IndexAndAttrSet> &AttrGrps = 
+      VE.getAttributeGroups(); 
+  if (AttrGrps.empty()) return; 
+ 
+  Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3); 
+ 
+  SmallVector<uint64_t, 64> Record; 
+  for (ValueEnumerator::IndexAndAttrSet Pair : AttrGrps) { 
+    unsigned AttrListIndex = Pair.first; 
+    AttributeSet AS = Pair.second; 
+    Record.push_back(VE.getAttributeGroupID(Pair)); 
+    Record.push_back(AttrListIndex); 
+ 
+    for (Attribute Attr : AS) { 
+      if (Attr.isEnumAttribute()) { 
+        Record.push_back(0); 
+        Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum())); 
+      } else if (Attr.isIntAttribute()) { 
+        Record.push_back(1); 
+        Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum())); 
+        Record.push_back(Attr.getValueAsInt()); 
+      } else if (Attr.isStringAttribute()) { 
+        StringRef Kind = Attr.getKindAsString(); 
+        StringRef Val = Attr.getValueAsString(); 
+ 
+        Record.push_back(Val.empty() ? 3 : 4); 
+        Record.append(Kind.begin(), Kind.end()); 
+        Record.push_back(0); 
+        if (!Val.empty()) { 
+          Record.append(Val.begin(), Val.end()); 
+          Record.push_back(0); 
+        } 
+      } else { 
+        assert(Attr.isTypeAttribute()); 
+        Type *Ty = Attr.getValueAsType(); 
+        Record.push_back(Ty ? 6 : 5); 
+        Record.push_back(getAttrKindEncoding(Attr.getKindAsEnum())); 
+        if (Ty) 
+          Record.push_back(VE.getTypeID(Attr.getValueAsType())); 
+      } 
+    } 
+ 
+    Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record); 
+    Record.clear(); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::writeAttributeTable() { 
+  const std::vector<AttributeList> &Attrs = VE.getAttributeLists(); 
+  if (Attrs.empty()) return; 
+ 
+  Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3); 
+ 
+  SmallVector<uint64_t, 64> Record; 
+  for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { 
+    AttributeList AL = Attrs[i]; 
+    for (unsigned i = AL.index_begin(), e = AL.index_end(); i != e; ++i) { 
+      AttributeSet AS = AL.getAttributes(i); 
+      if (AS.hasAttributes()) 
+        Record.push_back(VE.getAttributeGroupID({i, AS})); 
+    } 
+ 
+    Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record); 
+    Record.clear(); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+/// WriteTypeTable - Write out the type table for a module. 
+void ModuleBitcodeWriter::writeTypeTable() { 
+  const ValueEnumerator::TypeList &TypeList = VE.getTypes(); 
+ 
+  Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */); 
+  SmallVector<uint64_t, 64> TypeVals; 
+ 
+  uint64_t NumBits = VE.computeBitsRequiredForTypeIndicies(); 
+ 
+  // Abbrev for TYPE_CODE_POINTER. 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 
+  Abbv->Add(BitCodeAbbrevOp(0));  // Addrspace = 0 
+  unsigned PtrAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for TYPE_CODE_FUNCTION. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));  // isvararg 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 
+  unsigned FunctionAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for TYPE_CODE_STRUCT_ANON. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_ANON)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));  // ispacked 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 
+  unsigned StructAnonAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for TYPE_CODE_STRUCT_NAME. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 
+  unsigned StructNameAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for TYPE_CODE_STRUCT_NAMED. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAMED)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));  // ispacked 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 
+  unsigned StructNamedAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for TYPE_CODE_ARRAY. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // size 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits)); 
+  unsigned ArrayAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Emit an entry count so the reader can reserve space. 
+  TypeVals.push_back(TypeList.size()); 
+  Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals); 
+  TypeVals.clear(); 
+ 
+  // Loop over all of the types, emitting each in turn. 
+  for (unsigned i = 0, e = TypeList.size(); i != e; ++i) { 
+    Type *T = TypeList[i]; 
+    int AbbrevToUse = 0; 
+    unsigned Code = 0; 
+ 
+    switch (T->getTypeID()) { 
+    case Type::VoidTyID:      Code = bitc::TYPE_CODE_VOID;      break; 
+    case Type::HalfTyID:      Code = bitc::TYPE_CODE_HALF;      break; 
+    case Type::BFloatTyID:    Code = bitc::TYPE_CODE_BFLOAT;    break; 
+    case Type::FloatTyID:     Code = bitc::TYPE_CODE_FLOAT;     break; 
+    case Type::DoubleTyID:    Code = bitc::TYPE_CODE_DOUBLE;    break; 
+    case Type::X86_FP80TyID:  Code = bitc::TYPE_CODE_X86_FP80;  break; 
+    case Type::FP128TyID:     Code = bitc::TYPE_CODE_FP128;     break; 
+    case Type::PPC_FP128TyID: Code = bitc::TYPE_CODE_PPC_FP128; break; 
+    case Type::LabelTyID:     Code = bitc::TYPE_CODE_LABEL;     break; 
+    case Type::MetadataTyID:  Code = bitc::TYPE_CODE_METADATA;  break; 
+    case Type::X86_MMXTyID:   Code = bitc::TYPE_CODE_X86_MMX;   break; 
     case Type::X86_AMXTyID:   Code = bitc::TYPE_CODE_X86_AMX;   break;
-    case Type::TokenTyID:     Code = bitc::TYPE_CODE_TOKEN;     break;
-    case Type::IntegerTyID:
-      // INTEGER: [width]
-      Code = bitc::TYPE_CODE_INTEGER;
-      TypeVals.push_back(cast<IntegerType>(T)->getBitWidth());
-      break;
-    case Type::PointerTyID: {
-      PointerType *PTy = cast<PointerType>(T);
-      // POINTER: [pointee type, address space]
-      Code = bitc::TYPE_CODE_POINTER;
-      TypeVals.push_back(VE.getTypeID(PTy->getElementType()));
-      unsigned AddressSpace = PTy->getAddressSpace();
-      TypeVals.push_back(AddressSpace);
-      if (AddressSpace == 0) AbbrevToUse = PtrAbbrev;
-      break;
-    }
-    case Type::FunctionTyID: {
-      FunctionType *FT = cast<FunctionType>(T);
-      // FUNCTION: [isvararg, retty, paramty x N]
-      Code = bitc::TYPE_CODE_FUNCTION;
-      TypeVals.push_back(FT->isVarArg());
-      TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
-      for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
-        TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
-      AbbrevToUse = FunctionAbbrev;
-      break;
-    }
-    case Type::StructTyID: {
-      StructType *ST = cast<StructType>(T);
-      // STRUCT: [ispacked, eltty x N]
-      TypeVals.push_back(ST->isPacked());
-      // Output all of the element types.
-      for (StructType::element_iterator I = ST->element_begin(),
-           E = ST->element_end(); I != E; ++I)
-        TypeVals.push_back(VE.getTypeID(*I));
-
-      if (ST->isLiteral()) {
-        Code = bitc::TYPE_CODE_STRUCT_ANON;
-        AbbrevToUse = StructAnonAbbrev;
-      } else {
-        if (ST->isOpaque()) {
-          Code = bitc::TYPE_CODE_OPAQUE;
-        } else {
-          Code = bitc::TYPE_CODE_STRUCT_NAMED;
-          AbbrevToUse = StructNamedAbbrev;
-        }
-
-        // Emit the name if it is present.
-        if (!ST->getName().empty())
-          writeStringRecord(Stream, bitc::TYPE_CODE_STRUCT_NAME, ST->getName(),
-                            StructNameAbbrev);
-      }
-      break;
-    }
-    case Type::ArrayTyID: {
-      ArrayType *AT = cast<ArrayType>(T);
-      // ARRAY: [numelts, eltty]
-      Code = bitc::TYPE_CODE_ARRAY;
-      TypeVals.push_back(AT->getNumElements());
-      TypeVals.push_back(VE.getTypeID(AT->getElementType()));
-      AbbrevToUse = ArrayAbbrev;
-      break;
-    }
-    case Type::FixedVectorTyID:
-    case Type::ScalableVectorTyID: {
-      VectorType *VT = cast<VectorType>(T);
-      // VECTOR [numelts, eltty] or
-      //        [numelts, eltty, scalable]
-      Code = bitc::TYPE_CODE_VECTOR;
+    case Type::TokenTyID:     Code = bitc::TYPE_CODE_TOKEN;     break; 
+    case Type::IntegerTyID: 
+      // INTEGER: [width] 
+      Code = bitc::TYPE_CODE_INTEGER; 
+      TypeVals.push_back(cast<IntegerType>(T)->getBitWidth()); 
+      break; 
+    case Type::PointerTyID: { 
+      PointerType *PTy = cast<PointerType>(T); 
+      // POINTER: [pointee type, address space] 
+      Code = bitc::TYPE_CODE_POINTER; 
+      TypeVals.push_back(VE.getTypeID(PTy->getElementType())); 
+      unsigned AddressSpace = PTy->getAddressSpace(); 
+      TypeVals.push_back(AddressSpace); 
+      if (AddressSpace == 0) AbbrevToUse = PtrAbbrev; 
+      break; 
+    } 
+    case Type::FunctionTyID: { 
+      FunctionType *FT = cast<FunctionType>(T); 
+      // FUNCTION: [isvararg, retty, paramty x N] 
+      Code = bitc::TYPE_CODE_FUNCTION; 
+      TypeVals.push_back(FT->isVarArg()); 
+      TypeVals.push_back(VE.getTypeID(FT->getReturnType())); 
+      for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) 
+        TypeVals.push_back(VE.getTypeID(FT->getParamType(i))); 
+      AbbrevToUse = FunctionAbbrev; 
+      break; 
+    } 
+    case Type::StructTyID: { 
+      StructType *ST = cast<StructType>(T); 
+      // STRUCT: [ispacked, eltty x N] 
+      TypeVals.push_back(ST->isPacked()); 
+      // Output all of the element types. 
+      for (StructType::element_iterator I = ST->element_begin(), 
+           E = ST->element_end(); I != E; ++I) 
+        TypeVals.push_back(VE.getTypeID(*I)); 
+ 
+      if (ST->isLiteral()) { 
+        Code = bitc::TYPE_CODE_STRUCT_ANON; 
+        AbbrevToUse = StructAnonAbbrev; 
+      } else { 
+        if (ST->isOpaque()) { 
+          Code = bitc::TYPE_CODE_OPAQUE; 
+        } else { 
+          Code = bitc::TYPE_CODE_STRUCT_NAMED; 
+          AbbrevToUse = StructNamedAbbrev; 
+        } 
+ 
+        // Emit the name if it is present. 
+        if (!ST->getName().empty()) 
+          writeStringRecord(Stream, bitc::TYPE_CODE_STRUCT_NAME, ST->getName(), 
+                            StructNameAbbrev); 
+      } 
+      break; 
+    } 
+    case Type::ArrayTyID: { 
+      ArrayType *AT = cast<ArrayType>(T); 
+      // ARRAY: [numelts, eltty] 
+      Code = bitc::TYPE_CODE_ARRAY; 
+      TypeVals.push_back(AT->getNumElements()); 
+      TypeVals.push_back(VE.getTypeID(AT->getElementType())); 
+      AbbrevToUse = ArrayAbbrev; 
+      break; 
+    } 
+    case Type::FixedVectorTyID: 
+    case Type::ScalableVectorTyID: { 
+      VectorType *VT = cast<VectorType>(T); 
+      // VECTOR [numelts, eltty] or 
+      //        [numelts, eltty, scalable] 
+      Code = bitc::TYPE_CODE_VECTOR; 
       TypeVals.push_back(VT->getElementCount().getKnownMinValue());
-      TypeVals.push_back(VE.getTypeID(VT->getElementType()));
-      if (isa<ScalableVectorType>(VT))
-        TypeVals.push_back(true);
-      break;
-    }
-    }
-
-    // Emit the finished record.
-    Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
-    TypeVals.clear();
-  }
-
-  Stream.ExitBlock();
-}
-
-static unsigned getEncodedLinkage(const GlobalValue::LinkageTypes Linkage) {
-  switch (Linkage) {
-  case GlobalValue::ExternalLinkage:
-    return 0;
-  case GlobalValue::WeakAnyLinkage:
-    return 16;
-  case GlobalValue::AppendingLinkage:
-    return 2;
-  case GlobalValue::InternalLinkage:
-    return 3;
-  case GlobalValue::LinkOnceAnyLinkage:
-    return 18;
-  case GlobalValue::ExternalWeakLinkage:
-    return 7;
-  case GlobalValue::CommonLinkage:
-    return 8;
-  case GlobalValue::PrivateLinkage:
-    return 9;
-  case GlobalValue::WeakODRLinkage:
-    return 17;
-  case GlobalValue::LinkOnceODRLinkage:
-    return 19;
-  case GlobalValue::AvailableExternallyLinkage:
-    return 12;
-  }
-  llvm_unreachable("Invalid linkage");
-}
-
-static unsigned getEncodedLinkage(const GlobalValue &GV) {
-  return getEncodedLinkage(GV.getLinkage());
-}
-
-static uint64_t getEncodedFFlags(FunctionSummary::FFlags Flags) {
-  uint64_t RawFlags = 0;
-  RawFlags |= Flags.ReadNone;
-  RawFlags |= (Flags.ReadOnly << 1);
-  RawFlags |= (Flags.NoRecurse << 2);
-  RawFlags |= (Flags.ReturnDoesNotAlias << 3);
-  RawFlags |= (Flags.NoInline << 4);
-  RawFlags |= (Flags.AlwaysInline << 5);
-  return RawFlags;
-}
-
-// Decode the flags for GlobalValue in the summary
-static uint64_t getEncodedGVSummaryFlags(GlobalValueSummary::GVFlags Flags) {
-  uint64_t RawFlags = 0;
-
-  RawFlags |= Flags.NotEligibleToImport; // bool
-  RawFlags |= (Flags.Live << 1);
-  RawFlags |= (Flags.DSOLocal << 2);
-  RawFlags |= (Flags.CanAutoHide << 3);
-
-  // Linkage don't need to be remapped at that time for the summary. Any future
-  // change to the getEncodedLinkage() function will need to be taken into
-  // account here as well.
-  RawFlags = (RawFlags << 4) | Flags.Linkage; // 4 bits
-
-  return RawFlags;
-}
-
-static uint64_t getEncodedGVarFlags(GlobalVarSummary::GVarFlags Flags) {
-  uint64_t RawFlags = Flags.MaybeReadOnly | (Flags.MaybeWriteOnly << 1) |
-                      (Flags.Constant << 2) | Flags.VCallVisibility << 3;
-  return RawFlags;
-}
-
-static unsigned getEncodedVisibility(const GlobalValue &GV) {
-  switch (GV.getVisibility()) {
-  case GlobalValue::DefaultVisibility:   return 0;
-  case GlobalValue::HiddenVisibility:    return 1;
-  case GlobalValue::ProtectedVisibility: return 2;
-  }
-  llvm_unreachable("Invalid visibility");
-}
-
-static unsigned getEncodedDLLStorageClass(const GlobalValue &GV) {
-  switch (GV.getDLLStorageClass()) {
-  case GlobalValue::DefaultStorageClass:   return 0;
-  case GlobalValue::DLLImportStorageClass: return 1;
-  case GlobalValue::DLLExportStorageClass: return 2;
-  }
-  llvm_unreachable("Invalid DLL storage class");
-}
-
-static unsigned getEncodedThreadLocalMode(const GlobalValue &GV) {
-  switch (GV.getThreadLocalMode()) {
-    case GlobalVariable::NotThreadLocal:         return 0;
-    case GlobalVariable::GeneralDynamicTLSModel: return 1;
-    case GlobalVariable::LocalDynamicTLSModel:   return 2;
-    case GlobalVariable::InitialExecTLSModel:    return 3;
-    case GlobalVariable::LocalExecTLSModel:      return 4;
-  }
-  llvm_unreachable("Invalid TLS model");
-}
-
-static unsigned getEncodedComdatSelectionKind(const Comdat &C) {
-  switch (C.getSelectionKind()) {
-  case Comdat::Any:
-    return bitc::COMDAT_SELECTION_KIND_ANY;
-  case Comdat::ExactMatch:
-    return bitc::COMDAT_SELECTION_KIND_EXACT_MATCH;
-  case Comdat::Largest:
-    return bitc::COMDAT_SELECTION_KIND_LARGEST;
-  case Comdat::NoDuplicates:
-    return bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES;
-  case Comdat::SameSize:
-    return bitc::COMDAT_SELECTION_KIND_SAME_SIZE;
-  }
-  llvm_unreachable("Invalid selection kind");
-}
-
-static unsigned getEncodedUnnamedAddr(const GlobalValue &GV) {
-  switch (GV.getUnnamedAddr()) {
-  case GlobalValue::UnnamedAddr::None:   return 0;
-  case GlobalValue::UnnamedAddr::Local:  return 2;
-  case GlobalValue::UnnamedAddr::Global: return 1;
-  }
-  llvm_unreachable("Invalid unnamed_addr");
-}
-
-size_t ModuleBitcodeWriter::addToStrtab(StringRef Str) {
-  if (GenerateHash)
-    Hasher.update(Str);
-  return StrtabBuilder.add(Str);
-}
-
-void ModuleBitcodeWriter::writeComdats() {
-  SmallVector<unsigned, 64> Vals;
-  for (const Comdat *C : VE.getComdats()) {
-    // COMDAT: [strtab offset, strtab size, selection_kind]
-    Vals.push_back(addToStrtab(C->getName()));
-    Vals.push_back(C->getName().size());
-    Vals.push_back(getEncodedComdatSelectionKind(*C));
-    Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);
-    Vals.clear();
-  }
-}
-
-/// Write a record that will eventually hold the word offset of the
-/// module-level VST. For now the offset is 0, which will be backpatched
-/// after the real VST is written. Saves the bit offset to backpatch.
-void ModuleBitcodeWriter::writeValueSymbolTableForwardDecl() {
-  // Write a placeholder value in for the offset of the real VST,
-  // which is written after the function blocks so that it can include
-  // the offset of each function. The placeholder offset will be
-  // updated when the real VST is written.
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_VSTOFFSET));
-  // Blocks are 32-bit aligned, so we can use a 32-bit word offset to
-  // hold the real VST offset. Must use fixed instead of VBR as we don't
-  // know how many VBR chunks to reserve ahead of time.
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  unsigned VSTOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Emit the placeholder
-  uint64_t Vals[] = {bitc::MODULE_CODE_VSTOFFSET, 0};
-  Stream.EmitRecordWithAbbrev(VSTOffsetAbbrev, Vals);
-
-  // Compute and save the bit offset to the placeholder, which will be
-  // patched when the real VST is written. We can simply subtract the 32-bit
-  // fixed size from the current bit number to get the location to backpatch.
-  VSTOffsetPlaceholder = Stream.GetCurrentBitNo() - 32;
-}
-
-enum StringEncoding { SE_Char6, SE_Fixed7, SE_Fixed8 };
-
-/// Determine the encoding to use for the given string name and length.
-static StringEncoding getStringEncoding(StringRef Str) {
-  bool isChar6 = true;
-  for (char C : Str) {
-    if (isChar6)
-      isChar6 = BitCodeAbbrevOp::isChar6(C);
-    if ((unsigned char)C & 128)
-      // don't bother scanning the rest.
-      return SE_Fixed8;
-  }
-  if (isChar6)
-    return SE_Char6;
-  return SE_Fixed7;
-}
-
-/// Emit top-level description of module, including target triple, inline asm,
-/// descriptors for global variables, and function prototype info.
-/// Returns the bit offset to backpatch with the location of the real VST.
-void ModuleBitcodeWriter::writeModuleInfo() {
-  // Emit various pieces of data attached to a module.
-  if (!M.getTargetTriple().empty())
-    writeStringRecord(Stream, bitc::MODULE_CODE_TRIPLE, M.getTargetTriple(),
-                      0 /*TODO*/);
-  const std::string &DL = M.getDataLayoutStr();
-  if (!DL.empty())
-    writeStringRecord(Stream, bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/);
-  if (!M.getModuleInlineAsm().empty())
-    writeStringRecord(Stream, bitc::MODULE_CODE_ASM, M.getModuleInlineAsm(),
-                      0 /*TODO*/);
-
-  // Emit information about sections and GC, computing how many there are. Also
-  // compute the maximum alignment value.
-  std::map<std::string, unsigned> SectionMap;
-  std::map<std::string, unsigned> GCMap;
+      TypeVals.push_back(VE.getTypeID(VT->getElementType())); 
+      if (isa<ScalableVectorType>(VT)) 
+        TypeVals.push_back(true); 
+      break; 
+    } 
+    } 
+ 
+    // Emit the finished record. 
+    Stream.EmitRecord(Code, TypeVals, AbbrevToUse); 
+    TypeVals.clear(); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+static unsigned getEncodedLinkage(const GlobalValue::LinkageTypes Linkage) { 
+  switch (Linkage) { 
+  case GlobalValue::ExternalLinkage: 
+    return 0; 
+  case GlobalValue::WeakAnyLinkage: 
+    return 16; 
+  case GlobalValue::AppendingLinkage: 
+    return 2; 
+  case GlobalValue::InternalLinkage: 
+    return 3; 
+  case GlobalValue::LinkOnceAnyLinkage: 
+    return 18; 
+  case GlobalValue::ExternalWeakLinkage: 
+    return 7; 
+  case GlobalValue::CommonLinkage: 
+    return 8; 
+  case GlobalValue::PrivateLinkage: 
+    return 9; 
+  case GlobalValue::WeakODRLinkage: 
+    return 17; 
+  case GlobalValue::LinkOnceODRLinkage: 
+    return 19; 
+  case GlobalValue::AvailableExternallyLinkage: 
+    return 12; 
+  } 
+  llvm_unreachable("Invalid linkage"); 
+} 
+ 
+static unsigned getEncodedLinkage(const GlobalValue &GV) { 
+  return getEncodedLinkage(GV.getLinkage()); 
+} 
+ 
+static uint64_t getEncodedFFlags(FunctionSummary::FFlags Flags) { 
+  uint64_t RawFlags = 0; 
+  RawFlags |= Flags.ReadNone; 
+  RawFlags |= (Flags.ReadOnly << 1); 
+  RawFlags |= (Flags.NoRecurse << 2); 
+  RawFlags |= (Flags.ReturnDoesNotAlias << 3); 
+  RawFlags |= (Flags.NoInline << 4); 
+  RawFlags |= (Flags.AlwaysInline << 5); 
+  return RawFlags; 
+} 
+ 
+// Decode the flags for GlobalValue in the summary 
+static uint64_t getEncodedGVSummaryFlags(GlobalValueSummary::GVFlags Flags) { 
+  uint64_t RawFlags = 0; 
+ 
+  RawFlags |= Flags.NotEligibleToImport; // bool 
+  RawFlags |= (Flags.Live << 1); 
+  RawFlags |= (Flags.DSOLocal << 2); 
+  RawFlags |= (Flags.CanAutoHide << 3); 
+ 
+  // Linkage don't need to be remapped at that time for the summary. Any future 
+  // change to the getEncodedLinkage() function will need to be taken into 
+  // account here as well. 
+  RawFlags = (RawFlags << 4) | Flags.Linkage; // 4 bits 
+ 
+  return RawFlags; 
+} 
+ 
+static uint64_t getEncodedGVarFlags(GlobalVarSummary::GVarFlags Flags) { 
+  uint64_t RawFlags = Flags.MaybeReadOnly | (Flags.MaybeWriteOnly << 1) | 
+                      (Flags.Constant << 2) | Flags.VCallVisibility << 3; 
+  return RawFlags; 
+} 
+ 
+static unsigned getEncodedVisibility(const GlobalValue &GV) { 
+  switch (GV.getVisibility()) { 
+  case GlobalValue::DefaultVisibility:   return 0; 
+  case GlobalValue::HiddenVisibility:    return 1; 
+  case GlobalValue::ProtectedVisibility: return 2; 
+  } 
+  llvm_unreachable("Invalid visibility"); 
+} 
+ 
+static unsigned getEncodedDLLStorageClass(const GlobalValue &GV) { 
+  switch (GV.getDLLStorageClass()) { 
+  case GlobalValue::DefaultStorageClass:   return 0; 
+  case GlobalValue::DLLImportStorageClass: return 1; 
+  case GlobalValue::DLLExportStorageClass: return 2; 
+  } 
+  llvm_unreachable("Invalid DLL storage class"); 
+} 
+ 
+static unsigned getEncodedThreadLocalMode(const GlobalValue &GV) { 
+  switch (GV.getThreadLocalMode()) { 
+    case GlobalVariable::NotThreadLocal:         return 0; 
+    case GlobalVariable::GeneralDynamicTLSModel: return 1; 
+    case GlobalVariable::LocalDynamicTLSModel:   return 2; 
+    case GlobalVariable::InitialExecTLSModel:    return 3; 
+    case GlobalVariable::LocalExecTLSModel:      return 4; 
+  } 
+  llvm_unreachable("Invalid TLS model"); 
+} 
+ 
+static unsigned getEncodedComdatSelectionKind(const Comdat &C) { 
+  switch (C.getSelectionKind()) { 
+  case Comdat::Any: 
+    return bitc::COMDAT_SELECTION_KIND_ANY; 
+  case Comdat::ExactMatch: 
+    return bitc::COMDAT_SELECTION_KIND_EXACT_MATCH; 
+  case Comdat::Largest: 
+    return bitc::COMDAT_SELECTION_KIND_LARGEST; 
+  case Comdat::NoDuplicates: 
+    return bitc::COMDAT_SELECTION_KIND_NO_DUPLICATES; 
+  case Comdat::SameSize: 
+    return bitc::COMDAT_SELECTION_KIND_SAME_SIZE; 
+  } 
+  llvm_unreachable("Invalid selection kind"); 
+} 
+ 
+static unsigned getEncodedUnnamedAddr(const GlobalValue &GV) { 
+  switch (GV.getUnnamedAddr()) { 
+  case GlobalValue::UnnamedAddr::None:   return 0; 
+  case GlobalValue::UnnamedAddr::Local:  return 2; 
+  case GlobalValue::UnnamedAddr::Global: return 1; 
+  } 
+  llvm_unreachable("Invalid unnamed_addr"); 
+} 
+ 
+size_t ModuleBitcodeWriter::addToStrtab(StringRef Str) { 
+  if (GenerateHash) 
+    Hasher.update(Str); 
+  return StrtabBuilder.add(Str); 
+} 
+ 
+void ModuleBitcodeWriter::writeComdats() { 
+  SmallVector<unsigned, 64> Vals; 
+  for (const Comdat *C : VE.getComdats()) { 
+    // COMDAT: [strtab offset, strtab size, selection_kind] 
+    Vals.push_back(addToStrtab(C->getName())); 
+    Vals.push_back(C->getName().size()); 
+    Vals.push_back(getEncodedComdatSelectionKind(*C)); 
+    Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0); 
+    Vals.clear(); 
+  } 
+} 
+ 
+/// Write a record that will eventually hold the word offset of the 
+/// module-level VST. For now the offset is 0, which will be backpatched 
+/// after the real VST is written. Saves the bit offset to backpatch. 
+void ModuleBitcodeWriter::writeValueSymbolTableForwardDecl() { 
+  // Write a placeholder value in for the offset of the real VST, 
+  // which is written after the function blocks so that it can include 
+  // the offset of each function. The placeholder offset will be 
+  // updated when the real VST is written. 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_VSTOFFSET)); 
+  // Blocks are 32-bit aligned, so we can use a 32-bit word offset to 
+  // hold the real VST offset. Must use fixed instead of VBR as we don't 
+  // know how many VBR chunks to reserve ahead of time. 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); 
+  unsigned VSTOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Emit the placeholder 
+  uint64_t Vals[] = {bitc::MODULE_CODE_VSTOFFSET, 0}; 
+  Stream.EmitRecordWithAbbrev(VSTOffsetAbbrev, Vals); 
+ 
+  // Compute and save the bit offset to the placeholder, which will be 
+  // patched when the real VST is written. We can simply subtract the 32-bit 
+  // fixed size from the current bit number to get the location to backpatch. 
+  VSTOffsetPlaceholder = Stream.GetCurrentBitNo() - 32; 
+} 
+ 
+enum StringEncoding { SE_Char6, SE_Fixed7, SE_Fixed8 }; 
+ 
+/// Determine the encoding to use for the given string name and length. 
+static StringEncoding getStringEncoding(StringRef Str) { 
+  bool isChar6 = true; 
+  for (char C : Str) { 
+    if (isChar6) 
+      isChar6 = BitCodeAbbrevOp::isChar6(C); 
+    if ((unsigned char)C & 128) 
+      // don't bother scanning the rest. 
+      return SE_Fixed8; 
+  } 
+  if (isChar6) 
+    return SE_Char6; 
+  return SE_Fixed7; 
+} 
+ 
+/// Emit top-level description of module, including target triple, inline asm, 
+/// descriptors for global variables, and function prototype info. 
+/// Returns the bit offset to backpatch with the location of the real VST. 
+void ModuleBitcodeWriter::writeModuleInfo() { 
+  // Emit various pieces of data attached to a module. 
+  if (!M.getTargetTriple().empty()) 
+    writeStringRecord(Stream, bitc::MODULE_CODE_TRIPLE, M.getTargetTriple(), 
+                      0 /*TODO*/); 
+  const std::string &DL = M.getDataLayoutStr(); 
+  if (!DL.empty()) 
+    writeStringRecord(Stream, bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/); 
+  if (!M.getModuleInlineAsm().empty()) 
+    writeStringRecord(Stream, bitc::MODULE_CODE_ASM, M.getModuleInlineAsm(), 
+                      0 /*TODO*/); 
+ 
+  // Emit information about sections and GC, computing how many there are. Also 
+  // compute the maximum alignment value. 
+  std::map<std::string, unsigned> SectionMap; 
+  std::map<std::string, unsigned> GCMap; 
   MaybeAlign MaxAlignment;
-  unsigned MaxGlobalType = 0;
+  unsigned MaxGlobalType = 0; 
   const auto UpdateMaxAlignment = [&MaxAlignment](const MaybeAlign A) {
     if (A)
       MaxAlignment = !MaxAlignment ? *A : std::max(*MaxAlignment, *A);
   };
-  for (const GlobalVariable &GV : M.globals()) {
+  for (const GlobalVariable &GV : M.globals()) { 
     UpdateMaxAlignment(GV.getAlign());
-    MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getValueType()));
-    if (GV.hasSection()) {
-      // Give section names unique ID's.
-      unsigned &Entry = SectionMap[std::string(GV.getSection())];
-      if (!Entry) {
-        writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, GV.getSection(),
-                          0 /*TODO*/);
-        Entry = SectionMap.size();
-      }
-    }
-  }
-  for (const Function &F : M) {
+    MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getValueType())); 
+    if (GV.hasSection()) { 
+      // Give section names unique ID's. 
+      unsigned &Entry = SectionMap[std::string(GV.getSection())]; 
+      if (!Entry) { 
+        writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, GV.getSection(), 
+                          0 /*TODO*/); 
+        Entry = SectionMap.size(); 
+      } 
+    } 
+  } 
+  for (const Function &F : M) { 
     UpdateMaxAlignment(F.getAlign());
-    if (F.hasSection()) {
-      // Give section names unique ID's.
-      unsigned &Entry = SectionMap[std::string(F.getSection())];
-      if (!Entry) {
-        writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, F.getSection(),
-                          0 /*TODO*/);
-        Entry = SectionMap.size();
-      }
-    }
-    if (F.hasGC()) {
-      // Same for GC names.
-      unsigned &Entry = GCMap[F.getGC()];
-      if (!Entry) {
-        writeStringRecord(Stream, bitc::MODULE_CODE_GCNAME, F.getGC(),
-                          0 /*TODO*/);
-        Entry = GCMap.size();
-      }
-    }
-  }
-
-  // Emit abbrev for globals, now that we know # sections and max alignment.
-  unsigned SimpleGVarAbbrev = 0;
-  if (!M.global_empty()) {
-    // Add an abbrev for common globals with no visibility or thread localness.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
-                              Log2_32_Ceil(MaxGlobalType+1)));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddrSpace << 2
-                                                           //| explicitType << 1
-                                                           //| constant
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Initializer.
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage.
+    if (F.hasSection()) { 
+      // Give section names unique ID's. 
+      unsigned &Entry = SectionMap[std::string(F.getSection())]; 
+      if (!Entry) { 
+        writeStringRecord(Stream, bitc::MODULE_CODE_SECTIONNAME, F.getSection(), 
+                          0 /*TODO*/); 
+        Entry = SectionMap.size(); 
+      } 
+    } 
+    if (F.hasGC()) { 
+      // Same for GC names. 
+      unsigned &Entry = GCMap[F.getGC()]; 
+      if (!Entry) { 
+        writeStringRecord(Stream, bitc::MODULE_CODE_GCNAME, F.getGC(), 
+                          0 /*TODO*/); 
+        Entry = GCMap.size(); 
+      } 
+    } 
+  } 
+ 
+  // Emit abbrev for globals, now that we know # sections and max alignment. 
+  unsigned SimpleGVarAbbrev = 0; 
+  if (!M.global_empty()) { 
+    // Add an abbrev for common globals with no visibility or thread localness. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 
+                              Log2_32_Ceil(MaxGlobalType+1))); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddrSpace << 2 
+                                                           //| explicitType << 1 
+                                                           //| constant 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Initializer. 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // Linkage. 
     if (!MaxAlignment)                                     // Alignment.
-      Abbv->Add(BitCodeAbbrevOp(0));
-    else {
+      Abbv->Add(BitCodeAbbrevOp(0)); 
+    else { 
       unsigned MaxEncAlignment = getEncodedAlign(MaxAlignment);
-      Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
-                               Log2_32_Ceil(MaxEncAlignment+1)));
-    }
-    if (SectionMap.empty())                                    // Section.
-      Abbv->Add(BitCodeAbbrevOp(0));
-    else
-      Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
-                               Log2_32_Ceil(SectionMap.size()+1)));
-    // Don't bother emitting vis + thread local.
-    SimpleGVarAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-  }
-
-  SmallVector<unsigned, 64> Vals;
-  // Emit the module's source file name.
-  {
-    StringEncoding Bits = getStringEncoding(M.getSourceFileName());
-    BitCodeAbbrevOp AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8);
-    if (Bits == SE_Char6)
-      AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Char6);
-    else if (Bits == SE_Fixed7)
-      AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7);
-
-    // MODULE_CODE_SOURCE_FILENAME: [namechar x N]
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_SOURCE_FILENAME));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(AbbrevOpToUse);
-    unsigned FilenameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-    for (const auto P : M.getSourceFileName())
-      Vals.push_back((unsigned char)P);
-
-    // Emit the finished record.
-    Stream.EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals, FilenameAbbrev);
-    Vals.clear();
-  }
-
-  // Emit the global variable information.
-  for (const GlobalVariable &GV : M.globals()) {
-    unsigned AbbrevToUse = 0;
-
-    // GLOBALVAR: [strtab offset, strtab size, type, isconst, initid,
-    //             linkage, alignment, section, visibility, threadlocal,
-    //             unnamed_addr, externally_initialized, dllstorageclass,
-    //             comdat, attributes, DSO_Local]
-    Vals.push_back(addToStrtab(GV.getName()));
-    Vals.push_back(GV.getName().size());
-    Vals.push_back(VE.getTypeID(GV.getValueType()));
-    Vals.push_back(GV.getType()->getAddressSpace() << 2 | 2 | GV.isConstant());
-    Vals.push_back(GV.isDeclaration() ? 0 :
-                   (VE.getValueID(GV.getInitializer()) + 1));
-    Vals.push_back(getEncodedLinkage(GV));
+      Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 
+                               Log2_32_Ceil(MaxEncAlignment+1))); 
+    } 
+    if (SectionMap.empty())                                    // Section. 
+      Abbv->Add(BitCodeAbbrevOp(0)); 
+    else 
+      Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 
+                               Log2_32_Ceil(SectionMap.size()+1))); 
+    // Don't bother emitting vis + thread local. 
+    SimpleGVarAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+  } 
+ 
+  SmallVector<unsigned, 64> Vals; 
+  // Emit the module's source file name. 
+  { 
+    StringEncoding Bits = getStringEncoding(M.getSourceFileName()); 
+    BitCodeAbbrevOp AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8); 
+    if (Bits == SE_Char6) 
+      AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Char6); 
+    else if (Bits == SE_Fixed7) 
+      AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7); 
+ 
+    // MODULE_CODE_SOURCE_FILENAME: [namechar x N] 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_SOURCE_FILENAME)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(AbbrevOpToUse); 
+    unsigned FilenameAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+    for (const auto P : M.getSourceFileName()) 
+      Vals.push_back((unsigned char)P); 
+ 
+    // Emit the finished record. 
+    Stream.EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals, FilenameAbbrev); 
+    Vals.clear(); 
+  } 
+ 
+  // Emit the global variable information. 
+  for (const GlobalVariable &GV : M.globals()) { 
+    unsigned AbbrevToUse = 0; 
+ 
+    // GLOBALVAR: [strtab offset, strtab size, type, isconst, initid, 
+    //             linkage, alignment, section, visibility, threadlocal, 
+    //             unnamed_addr, externally_initialized, dllstorageclass, 
+    //             comdat, attributes, DSO_Local] 
+    Vals.push_back(addToStrtab(GV.getName())); 
+    Vals.push_back(GV.getName().size()); 
+    Vals.push_back(VE.getTypeID(GV.getValueType())); 
+    Vals.push_back(GV.getType()->getAddressSpace() << 2 | 2 | GV.isConstant()); 
+    Vals.push_back(GV.isDeclaration() ? 0 : 
+                   (VE.getValueID(GV.getInitializer()) + 1)); 
+    Vals.push_back(getEncodedLinkage(GV)); 
     Vals.push_back(getEncodedAlign(GV.getAlign()));
-    Vals.push_back(GV.hasSection() ? SectionMap[std::string(GV.getSection())]
-                                   : 0);
-    if (GV.isThreadLocal() ||
-        GV.getVisibility() != GlobalValue::DefaultVisibility ||
-        GV.getUnnamedAddr() != GlobalValue::UnnamedAddr::None ||
-        GV.isExternallyInitialized() ||
-        GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass ||
-        GV.hasComdat() ||
-        GV.hasAttributes() ||
-        GV.isDSOLocal() ||
-        GV.hasPartition()) {
-      Vals.push_back(getEncodedVisibility(GV));
-      Vals.push_back(getEncodedThreadLocalMode(GV));
-      Vals.push_back(getEncodedUnnamedAddr(GV));
-      Vals.push_back(GV.isExternallyInitialized());
-      Vals.push_back(getEncodedDLLStorageClass(GV));
-      Vals.push_back(GV.hasComdat() ? VE.getComdatID(GV.getComdat()) : 0);
-
-      auto AL = GV.getAttributesAsList(AttributeList::FunctionIndex);
-      Vals.push_back(VE.getAttributeListID(AL));
-
-      Vals.push_back(GV.isDSOLocal());
-      Vals.push_back(addToStrtab(GV.getPartition()));
-      Vals.push_back(GV.getPartition().size());
-    } else {
-      AbbrevToUse = SimpleGVarAbbrev;
-    }
-
-    Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
-    Vals.clear();
-  }
-
-  // Emit the function proto information.
-  for (const Function &F : M) {
-    // FUNCTION:  [strtab offset, strtab size, type, callingconv, isproto,
-    //             linkage, paramattrs, alignment, section, visibility, gc,
-    //             unnamed_addr, prologuedata, dllstorageclass, comdat,
-    //             prefixdata, personalityfn, DSO_Local, addrspace]
-    Vals.push_back(addToStrtab(F.getName()));
-    Vals.push_back(F.getName().size());
-    Vals.push_back(VE.getTypeID(F.getFunctionType()));
-    Vals.push_back(F.getCallingConv());
-    Vals.push_back(F.isDeclaration());
-    Vals.push_back(getEncodedLinkage(F));
-    Vals.push_back(VE.getAttributeListID(F.getAttributes()));
+    Vals.push_back(GV.hasSection() ? SectionMap[std::string(GV.getSection())] 
+                                   : 0); 
+    if (GV.isThreadLocal() || 
+        GV.getVisibility() != GlobalValue::DefaultVisibility || 
+        GV.getUnnamedAddr() != GlobalValue::UnnamedAddr::None || 
+        GV.isExternallyInitialized() || 
+        GV.getDLLStorageClass() != GlobalValue::DefaultStorageClass || 
+        GV.hasComdat() || 
+        GV.hasAttributes() || 
+        GV.isDSOLocal() || 
+        GV.hasPartition()) { 
+      Vals.push_back(getEncodedVisibility(GV)); 
+      Vals.push_back(getEncodedThreadLocalMode(GV)); 
+      Vals.push_back(getEncodedUnnamedAddr(GV)); 
+      Vals.push_back(GV.isExternallyInitialized()); 
+      Vals.push_back(getEncodedDLLStorageClass(GV)); 
+      Vals.push_back(GV.hasComdat() ? VE.getComdatID(GV.getComdat()) : 0); 
+ 
+      auto AL = GV.getAttributesAsList(AttributeList::FunctionIndex); 
+      Vals.push_back(VE.getAttributeListID(AL)); 
+ 
+      Vals.push_back(GV.isDSOLocal()); 
+      Vals.push_back(addToStrtab(GV.getPartition())); 
+      Vals.push_back(GV.getPartition().size()); 
+    } else { 
+      AbbrevToUse = SimpleGVarAbbrev; 
+    } 
+ 
+    Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse); 
+    Vals.clear(); 
+  } 
+ 
+  // Emit the function proto information. 
+  for (const Function &F : M) { 
+    // FUNCTION:  [strtab offset, strtab size, type, callingconv, isproto, 
+    //             linkage, paramattrs, alignment, section, visibility, gc, 
+    //             unnamed_addr, prologuedata, dllstorageclass, comdat, 
+    //             prefixdata, personalityfn, DSO_Local, addrspace] 
+    Vals.push_back(addToStrtab(F.getName())); 
+    Vals.push_back(F.getName().size()); 
+    Vals.push_back(VE.getTypeID(F.getFunctionType())); 
+    Vals.push_back(F.getCallingConv()); 
+    Vals.push_back(F.isDeclaration()); 
+    Vals.push_back(getEncodedLinkage(F)); 
+    Vals.push_back(VE.getAttributeListID(F.getAttributes())); 
     Vals.push_back(getEncodedAlign(F.getAlign()));
-    Vals.push_back(F.hasSection() ? SectionMap[std::string(F.getSection())]
-                                  : 0);
-    Vals.push_back(getEncodedVisibility(F));
-    Vals.push_back(F.hasGC() ? GCMap[F.getGC()] : 0);
-    Vals.push_back(getEncodedUnnamedAddr(F));
-    Vals.push_back(F.hasPrologueData() ? (VE.getValueID(F.getPrologueData()) + 1)
-                                       : 0);
-    Vals.push_back(getEncodedDLLStorageClass(F));
-    Vals.push_back(F.hasComdat() ? VE.getComdatID(F.getComdat()) : 0);
-    Vals.push_back(F.hasPrefixData() ? (VE.getValueID(F.getPrefixData()) + 1)
-                                     : 0);
-    Vals.push_back(
-        F.hasPersonalityFn() ? (VE.getValueID(F.getPersonalityFn()) + 1) : 0);
-
-    Vals.push_back(F.isDSOLocal());
-    Vals.push_back(F.getAddressSpace());
-    Vals.push_back(addToStrtab(F.getPartition()));
-    Vals.push_back(F.getPartition().size());
-
-    unsigned AbbrevToUse = 0;
-    Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
-    Vals.clear();
-  }
-
-  // Emit the alias information.
-  for (const GlobalAlias &A : M.aliases()) {
-    // ALIAS: [strtab offset, strtab size, alias type, aliasee val#, linkage,
-    //         visibility, dllstorageclass, threadlocal, unnamed_addr,
-    //         DSO_Local]
-    Vals.push_back(addToStrtab(A.getName()));
-    Vals.push_back(A.getName().size());
-    Vals.push_back(VE.getTypeID(A.getValueType()));
-    Vals.push_back(A.getType()->getAddressSpace());
-    Vals.push_back(VE.getValueID(A.getAliasee()));
-    Vals.push_back(getEncodedLinkage(A));
-    Vals.push_back(getEncodedVisibility(A));
-    Vals.push_back(getEncodedDLLStorageClass(A));
-    Vals.push_back(getEncodedThreadLocalMode(A));
-    Vals.push_back(getEncodedUnnamedAddr(A));
-    Vals.push_back(A.isDSOLocal());
-    Vals.push_back(addToStrtab(A.getPartition()));
-    Vals.push_back(A.getPartition().size());
-
-    unsigned AbbrevToUse = 0;
-    Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
-    Vals.clear();
-  }
-
-  // Emit the ifunc information.
-  for (const GlobalIFunc &I : M.ifuncs()) {
-    // IFUNC: [strtab offset, strtab size, ifunc type, address space, resolver
-    //         val#, linkage, visibility, DSO_Local]
-    Vals.push_back(addToStrtab(I.getName()));
-    Vals.push_back(I.getName().size());
-    Vals.push_back(VE.getTypeID(I.getValueType()));
-    Vals.push_back(I.getType()->getAddressSpace());
-    Vals.push_back(VE.getValueID(I.getResolver()));
-    Vals.push_back(getEncodedLinkage(I));
-    Vals.push_back(getEncodedVisibility(I));
-    Vals.push_back(I.isDSOLocal());
-    Vals.push_back(addToStrtab(I.getPartition()));
-    Vals.push_back(I.getPartition().size());
-    Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals);
-    Vals.clear();
-  }
-
-  writeValueSymbolTableForwardDecl();
-}
-
-static uint64_t getOptimizationFlags(const Value *V) {
-  uint64_t Flags = 0;
-
-  if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) {
-    if (OBO->hasNoSignedWrap())
-      Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP;
-    if (OBO->hasNoUnsignedWrap())
-      Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP;
-  } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) {
-    if (PEO->isExact())
-      Flags |= 1 << bitc::PEO_EXACT;
-  } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) {
-    if (FPMO->hasAllowReassoc())
-      Flags |= bitc::AllowReassoc;
-    if (FPMO->hasNoNaNs())
-      Flags |= bitc::NoNaNs;
-    if (FPMO->hasNoInfs())
-      Flags |= bitc::NoInfs;
-    if (FPMO->hasNoSignedZeros())
-      Flags |= bitc::NoSignedZeros;
-    if (FPMO->hasAllowReciprocal())
-      Flags |= bitc::AllowReciprocal;
-    if (FPMO->hasAllowContract())
-      Flags |= bitc::AllowContract;
-    if (FPMO->hasApproxFunc())
-      Flags |= bitc::ApproxFunc;
-  }
-
-  return Flags;
-}
-
-void ModuleBitcodeWriter::writeValueAsMetadata(
-    const ValueAsMetadata *MD, SmallVectorImpl<uint64_t> &Record) {
-  // Mimic an MDNode with a value as one operand.
-  Value *V = MD->getValue();
-  Record.push_back(VE.getTypeID(V->getType()));
-  Record.push_back(VE.getValueID(V));
-  Stream.EmitRecord(bitc::METADATA_VALUE, Record, 0);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeMDTuple(const MDTuple *N,
-                                       SmallVectorImpl<uint64_t> &Record,
-                                       unsigned Abbrev) {
-  for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
-    Metadata *MD = N->getOperand(i);
-    assert(!(MD && isa<LocalAsMetadata>(MD)) &&
-           "Unexpected function-local metadata");
-    Record.push_back(VE.getMetadataOrNullID(MD));
-  }
-  Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE
-                                    : bitc::METADATA_NODE,
-                    Record, Abbrev);
-  Record.clear();
-}
-
-unsigned ModuleBitcodeWriter::createDILocationAbbrev() {
-  // Assume the column is usually under 128, and always output the inlined-at
-  // location (it's never more expensive than building an array size 1).
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_LOCATION));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
-  return Stream.EmitAbbrev(std::move(Abbv));
-}
-
-void ModuleBitcodeWriter::writeDILocation(const DILocation *N,
-                                          SmallVectorImpl<uint64_t> &Record,
-                                          unsigned &Abbrev) {
-  if (!Abbrev)
-    Abbrev = createDILocationAbbrev();
-
-  Record.push_back(N->isDistinct());
-  Record.push_back(N->getLine());
-  Record.push_back(N->getColumn());
-  Record.push_back(VE.getMetadataID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt()));
-  Record.push_back(N->isImplicitCode());
-
-  Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev);
-  Record.clear();
-}
-
-unsigned ModuleBitcodeWriter::createGenericDINodeAbbrev() {
-  // Assume the column is usually under 128, and always output the inlined-at
-  // location (it's never more expensive than building an array size 1).
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_GENERIC_DEBUG));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  return Stream.EmitAbbrev(std::move(Abbv));
-}
-
-void ModuleBitcodeWriter::writeGenericDINode(const GenericDINode *N,
-                                             SmallVectorImpl<uint64_t> &Record,
-                                             unsigned &Abbrev) {
-  if (!Abbrev)
-    Abbrev = createGenericDINodeAbbrev();
-
-  Record.push_back(N->isDistinct());
-  Record.push_back(N->getTag());
-  Record.push_back(0); // Per-tag version field; unused for now.
-
-  for (auto &I : N->operands())
-    Record.push_back(VE.getMetadataOrNullID(I));
-
-  Stream.EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDISubrange(const DISubrange *N,
-                                          SmallVectorImpl<uint64_t> &Record,
-                                          unsigned Abbrev) {
-  const uint64_t Version = 2 << 1;
-  Record.push_back((uint64_t)N->isDistinct() | Version);
-  Record.push_back(VE.getMetadataOrNullID(N->getRawCountNode()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawLowerBound()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawUpperBound()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawStride()));
-
-  Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev);
-  Record.clear();
-}
-
+    Vals.push_back(F.hasSection() ? SectionMap[std::string(F.getSection())] 
+                                  : 0); 
+    Vals.push_back(getEncodedVisibility(F)); 
+    Vals.push_back(F.hasGC() ? GCMap[F.getGC()] : 0); 
+    Vals.push_back(getEncodedUnnamedAddr(F)); 
+    Vals.push_back(F.hasPrologueData() ? (VE.getValueID(F.getPrologueData()) + 1) 
+                                       : 0); 
+    Vals.push_back(getEncodedDLLStorageClass(F)); 
+    Vals.push_back(F.hasComdat() ? VE.getComdatID(F.getComdat()) : 0); 
+    Vals.push_back(F.hasPrefixData() ? (VE.getValueID(F.getPrefixData()) + 1) 
+                                     : 0); 
+    Vals.push_back( 
+        F.hasPersonalityFn() ? (VE.getValueID(F.getPersonalityFn()) + 1) : 0); 
+ 
+    Vals.push_back(F.isDSOLocal()); 
+    Vals.push_back(F.getAddressSpace()); 
+    Vals.push_back(addToStrtab(F.getPartition())); 
+    Vals.push_back(F.getPartition().size()); 
+ 
+    unsigned AbbrevToUse = 0; 
+    Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse); 
+    Vals.clear(); 
+  } 
+ 
+  // Emit the alias information. 
+  for (const GlobalAlias &A : M.aliases()) { 
+    // ALIAS: [strtab offset, strtab size, alias type, aliasee val#, linkage, 
+    //         visibility, dllstorageclass, threadlocal, unnamed_addr, 
+    //         DSO_Local] 
+    Vals.push_back(addToStrtab(A.getName())); 
+    Vals.push_back(A.getName().size()); 
+    Vals.push_back(VE.getTypeID(A.getValueType())); 
+    Vals.push_back(A.getType()->getAddressSpace()); 
+    Vals.push_back(VE.getValueID(A.getAliasee())); 
+    Vals.push_back(getEncodedLinkage(A)); 
+    Vals.push_back(getEncodedVisibility(A)); 
+    Vals.push_back(getEncodedDLLStorageClass(A)); 
+    Vals.push_back(getEncodedThreadLocalMode(A)); 
+    Vals.push_back(getEncodedUnnamedAddr(A)); 
+    Vals.push_back(A.isDSOLocal()); 
+    Vals.push_back(addToStrtab(A.getPartition())); 
+    Vals.push_back(A.getPartition().size()); 
+ 
+    unsigned AbbrevToUse = 0; 
+    Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse); 
+    Vals.clear(); 
+  } 
+ 
+  // Emit the ifunc information. 
+  for (const GlobalIFunc &I : M.ifuncs()) { 
+    // IFUNC: [strtab offset, strtab size, ifunc type, address space, resolver 
+    //         val#, linkage, visibility, DSO_Local] 
+    Vals.push_back(addToStrtab(I.getName())); 
+    Vals.push_back(I.getName().size()); 
+    Vals.push_back(VE.getTypeID(I.getValueType())); 
+    Vals.push_back(I.getType()->getAddressSpace()); 
+    Vals.push_back(VE.getValueID(I.getResolver())); 
+    Vals.push_back(getEncodedLinkage(I)); 
+    Vals.push_back(getEncodedVisibility(I)); 
+    Vals.push_back(I.isDSOLocal()); 
+    Vals.push_back(addToStrtab(I.getPartition())); 
+    Vals.push_back(I.getPartition().size()); 
+    Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals); 
+    Vals.clear(); 
+  } 
+ 
+  writeValueSymbolTableForwardDecl(); 
+} 
+ 
+static uint64_t getOptimizationFlags(const Value *V) { 
+  uint64_t Flags = 0; 
+ 
+  if (const auto *OBO = dyn_cast<OverflowingBinaryOperator>(V)) { 
+    if (OBO->hasNoSignedWrap()) 
+      Flags |= 1 << bitc::OBO_NO_SIGNED_WRAP; 
+    if (OBO->hasNoUnsignedWrap()) 
+      Flags |= 1 << bitc::OBO_NO_UNSIGNED_WRAP; 
+  } else if (const auto *PEO = dyn_cast<PossiblyExactOperator>(V)) { 
+    if (PEO->isExact()) 
+      Flags |= 1 << bitc::PEO_EXACT; 
+  } else if (const auto *FPMO = dyn_cast<FPMathOperator>(V)) { 
+    if (FPMO->hasAllowReassoc()) 
+      Flags |= bitc::AllowReassoc; 
+    if (FPMO->hasNoNaNs()) 
+      Flags |= bitc::NoNaNs; 
+    if (FPMO->hasNoInfs()) 
+      Flags |= bitc::NoInfs; 
+    if (FPMO->hasNoSignedZeros()) 
+      Flags |= bitc::NoSignedZeros; 
+    if (FPMO->hasAllowReciprocal()) 
+      Flags |= bitc::AllowReciprocal; 
+    if (FPMO->hasAllowContract()) 
+      Flags |= bitc::AllowContract; 
+    if (FPMO->hasApproxFunc()) 
+      Flags |= bitc::ApproxFunc; 
+  } 
+ 
+  return Flags; 
+} 
+ 
+void ModuleBitcodeWriter::writeValueAsMetadata( 
+    const ValueAsMetadata *MD, SmallVectorImpl<uint64_t> &Record) { 
+  // Mimic an MDNode with a value as one operand. 
+  Value *V = MD->getValue(); 
+  Record.push_back(VE.getTypeID(V->getType())); 
+  Record.push_back(VE.getValueID(V)); 
+  Stream.EmitRecord(bitc::METADATA_VALUE, Record, 0); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeMDTuple(const MDTuple *N, 
+                                       SmallVectorImpl<uint64_t> &Record, 
+                                       unsigned Abbrev) { 
+  for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { 
+    Metadata *MD = N->getOperand(i); 
+    assert(!(MD && isa<LocalAsMetadata>(MD)) && 
+           "Unexpected function-local metadata"); 
+    Record.push_back(VE.getMetadataOrNullID(MD)); 
+  } 
+  Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE 
+                                    : bitc::METADATA_NODE, 
+                    Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+unsigned ModuleBitcodeWriter::createDILocationAbbrev() { 
+  // Assume the column is usually under 128, and always output the inlined-at 
+  // location (it's never more expensive than building an array size 1). 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_LOCATION)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 
+  return Stream.EmitAbbrev(std::move(Abbv)); 
+} 
+ 
+void ModuleBitcodeWriter::writeDILocation(const DILocation *N, 
+                                          SmallVectorImpl<uint64_t> &Record, 
+                                          unsigned &Abbrev) { 
+  if (!Abbrev) 
+    Abbrev = createDILocationAbbrev(); 
+ 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(N->getColumn()); 
+  Record.push_back(VE.getMetadataID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt())); 
+  Record.push_back(N->isImplicitCode()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+unsigned ModuleBitcodeWriter::createGenericDINodeAbbrev() { 
+  // Assume the column is usually under 128, and always output the inlined-at 
+  // location (it's never more expensive than building an array size 1). 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_GENERIC_DEBUG)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 
+  return Stream.EmitAbbrev(std::move(Abbv)); 
+} 
+ 
+void ModuleBitcodeWriter::writeGenericDINode(const GenericDINode *N, 
+                                             SmallVectorImpl<uint64_t> &Record, 
+                                             unsigned &Abbrev) { 
+  if (!Abbrev) 
+    Abbrev = createGenericDINodeAbbrev(); 
+ 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(N->getTag()); 
+  Record.push_back(0); // Per-tag version field; unused for now. 
+ 
+  for (auto &I : N->operands()) 
+    Record.push_back(VE.getMetadataOrNullID(I)); 
+ 
+  Stream.EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDISubrange(const DISubrange *N, 
+                                          SmallVectorImpl<uint64_t> &Record, 
+                                          unsigned Abbrev) { 
+  const uint64_t Version = 2 << 1; 
+  Record.push_back((uint64_t)N->isDistinct() | Version); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawCountNode())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawLowerBound())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawUpperBound())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawStride())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
 void ModuleBitcodeWriter::writeDIGenericSubrange(
     const DIGenericSubrange *N, SmallVectorImpl<uint64_t> &Record,
     unsigned Abbrev) {
@@ -1574,52 +1574,52 @@ void ModuleBitcodeWriter::writeDIGenericSubrange(
   Record.clear();
 }
 
-static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
-  if ((int64_t)V >= 0)
-    Vals.push_back(V << 1);
-  else
-    Vals.push_back((-V << 1) | 1);
-}
-
-static void emitWideAPInt(SmallVectorImpl<uint64_t> &Vals, const APInt &A) {
-  // We have an arbitrary precision integer value to write whose
-  // bit width is > 64. However, in canonical unsigned integer
-  // format it is likely that the high bits are going to be zero.
-  // So, we only write the number of active words.
-  unsigned NumWords = A.getActiveWords();
-  const uint64_t *RawData = A.getRawData();
-  for (unsigned i = 0; i < NumWords; i++)
-    emitSignedInt64(Vals, RawData[i]);
-}
-
-void ModuleBitcodeWriter::writeDIEnumerator(const DIEnumerator *N,
-                                            SmallVectorImpl<uint64_t> &Record,
-                                            unsigned Abbrev) {
-  const uint64_t IsBigInt = 1 << 2;
-  Record.push_back(IsBigInt | (N->isUnsigned() << 1) | N->isDistinct());
-  Record.push_back(N->getValue().getBitWidth());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  emitWideAPInt(Record, N->getValue());
-
-  Stream.EmitRecord(bitc::METADATA_ENUMERATOR, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIBasicType(const DIBasicType *N,
-                                           SmallVectorImpl<uint64_t> &Record,
-                                           unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(N->getTag());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(N->getSizeInBits());
-  Record.push_back(N->getAlignInBits());
-  Record.push_back(N->getEncoding());
-  Record.push_back(N->getFlags());
-
-  Stream.EmitRecord(bitc::METADATA_BASIC_TYPE, Record, Abbrev);
-  Record.clear();
-}
-
+static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) { 
+  if ((int64_t)V >= 0) 
+    Vals.push_back(V << 1); 
+  else 
+    Vals.push_back((-V << 1) | 1); 
+} 
+ 
+static void emitWideAPInt(SmallVectorImpl<uint64_t> &Vals, const APInt &A) { 
+  // We have an arbitrary precision integer value to write whose 
+  // bit width is > 64. However, in canonical unsigned integer 
+  // format it is likely that the high bits are going to be zero. 
+  // So, we only write the number of active words. 
+  unsigned NumWords = A.getActiveWords(); 
+  const uint64_t *RawData = A.getRawData(); 
+  for (unsigned i = 0; i < NumWords; i++) 
+    emitSignedInt64(Vals, RawData[i]); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIEnumerator(const DIEnumerator *N, 
+                                            SmallVectorImpl<uint64_t> &Record, 
+                                            unsigned Abbrev) { 
+  const uint64_t IsBigInt = 1 << 2; 
+  Record.push_back(IsBigInt | (N->isUnsigned() << 1) | N->isDistinct()); 
+  Record.push_back(N->getValue().getBitWidth()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  emitWideAPInt(Record, N->getValue()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_ENUMERATOR, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIBasicType(const DIBasicType *N, 
+                                           SmallVectorImpl<uint64_t> &Record, 
+                                           unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(N->getTag()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(N->getSizeInBits()); 
+  Record.push_back(N->getAlignInBits()); 
+  Record.push_back(N->getEncoding()); 
+  Record.push_back(N->getFlags()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_BASIC_TYPE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
 void ModuleBitcodeWriter::writeDIStringType(const DIStringType *N,
                                             SmallVectorImpl<uint64_t> &Record,
                                             unsigned Abbrev) {
@@ -1636,1372 +1636,1372 @@ void ModuleBitcodeWriter::writeDIStringType(const DIStringType *N,
   Record.clear();
 }
 
-void ModuleBitcodeWriter::writeDIDerivedType(const DIDerivedType *N,
-                                             SmallVectorImpl<uint64_t> &Record,
-                                             unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(N->getTag());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getBaseType()));
-  Record.push_back(N->getSizeInBits());
-  Record.push_back(N->getAlignInBits());
-  Record.push_back(N->getOffsetInBits());
-  Record.push_back(N->getFlags());
-  Record.push_back(VE.getMetadataOrNullID(N->getExtraData()));
-
-  // DWARF address space is encoded as N->getDWARFAddressSpace() + 1. 0 means
-  // that there is no DWARF address space associated with DIDerivedType.
-  if (const auto &DWARFAddressSpace = N->getDWARFAddressSpace())
-    Record.push_back(*DWARFAddressSpace + 1);
-  else
-    Record.push_back(0);
-
-  Stream.EmitRecord(bitc::METADATA_DERIVED_TYPE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDICompositeType(
-    const DICompositeType *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  const unsigned IsNotUsedInOldTypeRef = 0x2;
-  Record.push_back(IsNotUsedInOldTypeRef | (unsigned)N->isDistinct());
-  Record.push_back(N->getTag());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getBaseType()));
-  Record.push_back(N->getSizeInBits());
-  Record.push_back(N->getAlignInBits());
-  Record.push_back(N->getOffsetInBits());
-  Record.push_back(N->getFlags());
-  Record.push_back(VE.getMetadataOrNullID(N->getElements().get()));
-  Record.push_back(N->getRuntimeLang());
-  Record.push_back(VE.getMetadataOrNullID(N->getVTableHolder()));
-  Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawIdentifier()));
-  Record.push_back(VE.getMetadataOrNullID(N->getDiscriminator()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawDataLocation()));
+void ModuleBitcodeWriter::writeDIDerivedType(const DIDerivedType *N, 
+                                             SmallVectorImpl<uint64_t> &Record, 
+                                             unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(N->getTag()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getBaseType())); 
+  Record.push_back(N->getSizeInBits()); 
+  Record.push_back(N->getAlignInBits()); 
+  Record.push_back(N->getOffsetInBits()); 
+  Record.push_back(N->getFlags()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getExtraData())); 
+ 
+  // DWARF address space is encoded as N->getDWARFAddressSpace() + 1. 0 means 
+  // that there is no DWARF address space associated with DIDerivedType. 
+  if (const auto &DWARFAddressSpace = N->getDWARFAddressSpace()) 
+    Record.push_back(*DWARFAddressSpace + 1); 
+  else 
+    Record.push_back(0); 
+ 
+  Stream.EmitRecord(bitc::METADATA_DERIVED_TYPE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDICompositeType( 
+    const DICompositeType *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  const unsigned IsNotUsedInOldTypeRef = 0x2; 
+  Record.push_back(IsNotUsedInOldTypeRef | (unsigned)N->isDistinct()); 
+  Record.push_back(N->getTag()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getBaseType())); 
+  Record.push_back(N->getSizeInBits()); 
+  Record.push_back(N->getAlignInBits()); 
+  Record.push_back(N->getOffsetInBits()); 
+  Record.push_back(N->getFlags()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getElements().get())); 
+  Record.push_back(N->getRuntimeLang()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getVTableHolder())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawIdentifier())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getDiscriminator())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawDataLocation())); 
   Record.push_back(VE.getMetadataOrNullID(N->getRawAssociated()));
   Record.push_back(VE.getMetadataOrNullID(N->getRawAllocated()));
   Record.push_back(VE.getMetadataOrNullID(N->getRawRank()));
-
-  Stream.EmitRecord(bitc::METADATA_COMPOSITE_TYPE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDISubroutineType(
-    const DISubroutineType *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  const unsigned HasNoOldTypeRefs = 0x2;
-  Record.push_back(HasNoOldTypeRefs | (unsigned)N->isDistinct());
-  Record.push_back(N->getFlags());
-  Record.push_back(VE.getMetadataOrNullID(N->getTypeArray().get()));
-  Record.push_back(N->getCC());
-
-  Stream.EmitRecord(bitc::METADATA_SUBROUTINE_TYPE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIFile(const DIFile *N,
-                                      SmallVectorImpl<uint64_t> &Record,
-                                      unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawFilename()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawDirectory()));
-  if (N->getRawChecksum()) {
-    Record.push_back(N->getRawChecksum()->Kind);
-    Record.push_back(VE.getMetadataOrNullID(N->getRawChecksum()->Value));
-  } else {
-    // Maintain backwards compatibility with the old internal representation of
-    // CSK_None in ChecksumKind by writing nulls here when Checksum is None.
-    Record.push_back(0);
-    Record.push_back(VE.getMetadataOrNullID(nullptr));
-  }
-  auto Source = N->getRawSource();
-  if (Source)
-    Record.push_back(VE.getMetadataOrNullID(*Source));
-
-  Stream.EmitRecord(bitc::METADATA_FILE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDICompileUnit(const DICompileUnit *N,
-                                             SmallVectorImpl<uint64_t> &Record,
-                                             unsigned Abbrev) {
-  assert(N->isDistinct() && "Expected distinct compile units");
-  Record.push_back(/* IsDistinct */ true);
-  Record.push_back(N->getSourceLanguage());
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawProducer()));
-  Record.push_back(N->isOptimized());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawFlags()));
-  Record.push_back(N->getRuntimeVersion());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawSplitDebugFilename()));
-  Record.push_back(N->getEmissionKind());
-  Record.push_back(VE.getMetadataOrNullID(N->getEnumTypes().get()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRetainedTypes().get()));
-  Record.push_back(/* subprograms */ 0);
-  Record.push_back(VE.getMetadataOrNullID(N->getGlobalVariables().get()));
-  Record.push_back(VE.getMetadataOrNullID(N->getImportedEntities().get()));
-  Record.push_back(N->getDWOId());
-  Record.push_back(VE.getMetadataOrNullID(N->getMacros().get()));
-  Record.push_back(N->getSplitDebugInlining());
-  Record.push_back(N->getDebugInfoForProfiling());
-  Record.push_back((unsigned)N->getNameTableKind());
-  Record.push_back(N->getRangesBaseAddress());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawSysRoot()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawSDK()));
-
-  Stream.EmitRecord(bitc::METADATA_COMPILE_UNIT, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDISubprogram(const DISubprogram *N,
-                                            SmallVectorImpl<uint64_t> &Record,
-                                            unsigned Abbrev) {
-  const uint64_t HasUnitFlag = 1 << 1;
-  const uint64_t HasSPFlagsFlag = 1 << 2;
-  Record.push_back(uint64_t(N->isDistinct()) | HasUnitFlag | HasSPFlagsFlag);
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getType()));
-  Record.push_back(N->getScopeLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getContainingType()));
-  Record.push_back(N->getSPFlags());
-  Record.push_back(N->getVirtualIndex());
-  Record.push_back(N->getFlags());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawUnit()));
-  Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get()));
-  Record.push_back(VE.getMetadataOrNullID(N->getDeclaration()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRetainedNodes().get()));
-  Record.push_back(N->getThisAdjustment());
-  Record.push_back(VE.getMetadataOrNullID(N->getThrownTypes().get()));
-
-  Stream.EmitRecord(bitc::METADATA_SUBPROGRAM, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDILexicalBlock(const DILexicalBlock *N,
-                                              SmallVectorImpl<uint64_t> &Record,
-                                              unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getLine());
-  Record.push_back(N->getColumn());
-
-  Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDILexicalBlockFile(
-    const DILexicalBlockFile *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getDiscriminator());
-
-  Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK_FILE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDICommonBlock(const DICommonBlock *N,
-                                             SmallVectorImpl<uint64_t> &Record,
-                                             unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getDecl()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getLineNo());
-
-  Stream.EmitRecord(bitc::METADATA_COMMON_BLOCK, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDINamespace(const DINamespace *N,
-                                           SmallVectorImpl<uint64_t> &Record,
-                                           unsigned Abbrev) {
-  Record.push_back(N->isDistinct() | N->getExportSymbols() << 1);
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-
-  Stream.EmitRecord(bitc::METADATA_NAMESPACE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIMacro(const DIMacro *N,
-                                       SmallVectorImpl<uint64_t> &Record,
-                                       unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(N->getMacinfoType());
-  Record.push_back(N->getLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawValue()));
-
-  Stream.EmitRecord(bitc::METADATA_MACRO, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIMacroFile(const DIMacroFile *N,
-                                           SmallVectorImpl<uint64_t> &Record,
-                                           unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(N->getMacinfoType());
-  Record.push_back(N->getLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(VE.getMetadataOrNullID(N->getElements().get()));
-
-  Stream.EmitRecord(bitc::METADATA_MACRO_FILE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIModule(const DIModule *N,
-                                        SmallVectorImpl<uint64_t> &Record,
-                                        unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  for (auto &I : N->operands())
-    Record.push_back(VE.getMetadataOrNullID(I));
-  Record.push_back(N->getLineNo());
+ 
+  Stream.EmitRecord(bitc::METADATA_COMPOSITE_TYPE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDISubroutineType( 
+    const DISubroutineType *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  const unsigned HasNoOldTypeRefs = 0x2; 
+  Record.push_back(HasNoOldTypeRefs | (unsigned)N->isDistinct()); 
+  Record.push_back(N->getFlags()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getTypeArray().get())); 
+  Record.push_back(N->getCC()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_SUBROUTINE_TYPE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIFile(const DIFile *N, 
+                                      SmallVectorImpl<uint64_t> &Record, 
+                                      unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawFilename())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawDirectory())); 
+  if (N->getRawChecksum()) { 
+    Record.push_back(N->getRawChecksum()->Kind); 
+    Record.push_back(VE.getMetadataOrNullID(N->getRawChecksum()->Value)); 
+  } else { 
+    // Maintain backwards compatibility with the old internal representation of 
+    // CSK_None in ChecksumKind by writing nulls here when Checksum is None. 
+    Record.push_back(0); 
+    Record.push_back(VE.getMetadataOrNullID(nullptr)); 
+  } 
+  auto Source = N->getRawSource(); 
+  if (Source) 
+    Record.push_back(VE.getMetadataOrNullID(*Source)); 
+ 
+  Stream.EmitRecord(bitc::METADATA_FILE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDICompileUnit(const DICompileUnit *N, 
+                                             SmallVectorImpl<uint64_t> &Record, 
+                                             unsigned Abbrev) { 
+  assert(N->isDistinct() && "Expected distinct compile units"); 
+  Record.push_back(/* IsDistinct */ true); 
+  Record.push_back(N->getSourceLanguage()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawProducer())); 
+  Record.push_back(N->isOptimized()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawFlags())); 
+  Record.push_back(N->getRuntimeVersion()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawSplitDebugFilename())); 
+  Record.push_back(N->getEmissionKind()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getEnumTypes().get())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRetainedTypes().get())); 
+  Record.push_back(/* subprograms */ 0); 
+  Record.push_back(VE.getMetadataOrNullID(N->getGlobalVariables().get())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getImportedEntities().get())); 
+  Record.push_back(N->getDWOId()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getMacros().get())); 
+  Record.push_back(N->getSplitDebugInlining()); 
+  Record.push_back(N->getDebugInfoForProfiling()); 
+  Record.push_back((unsigned)N->getNameTableKind()); 
+  Record.push_back(N->getRangesBaseAddress()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawSysRoot())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawSDK())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_COMPILE_UNIT, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDISubprogram(const DISubprogram *N, 
+                                            SmallVectorImpl<uint64_t> &Record, 
+                                            unsigned Abbrev) { 
+  const uint64_t HasUnitFlag = 1 << 1; 
+  const uint64_t HasSPFlagsFlag = 1 << 2; 
+  Record.push_back(uint64_t(N->isDistinct()) | HasUnitFlag | HasSPFlagsFlag); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getType())); 
+  Record.push_back(N->getScopeLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getContainingType())); 
+  Record.push_back(N->getSPFlags()); 
+  Record.push_back(N->getVirtualIndex()); 
+  Record.push_back(N->getFlags()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawUnit())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getDeclaration())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRetainedNodes().get())); 
+  Record.push_back(N->getThisAdjustment()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getThrownTypes().get())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_SUBPROGRAM, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDILexicalBlock(const DILexicalBlock *N, 
+                                              SmallVectorImpl<uint64_t> &Record, 
+                                              unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(N->getColumn()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDILexicalBlockFile( 
+    const DILexicalBlockFile *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getDiscriminator()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK_FILE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDICommonBlock(const DICommonBlock *N, 
+                                             SmallVectorImpl<uint64_t> &Record, 
+                                             unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getDecl())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getLineNo()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_COMMON_BLOCK, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDINamespace(const DINamespace *N, 
+                                           SmallVectorImpl<uint64_t> &Record, 
+                                           unsigned Abbrev) { 
+  Record.push_back(N->isDistinct() | N->getExportSymbols() << 1); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_NAMESPACE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIMacro(const DIMacro *N, 
+                                       SmallVectorImpl<uint64_t> &Record, 
+                                       unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(N->getMacinfoType()); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawValue())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_MACRO, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIMacroFile(const DIMacroFile *N, 
+                                           SmallVectorImpl<uint64_t> &Record, 
+                                           unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(N->getMacinfoType()); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getElements().get())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_MACRO_FILE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIModule(const DIModule *N, 
+                                        SmallVectorImpl<uint64_t> &Record, 
+                                        unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  for (auto &I : N->operands()) 
+    Record.push_back(VE.getMetadataOrNullID(I)); 
+  Record.push_back(N->getLineNo()); 
   Record.push_back(N->getIsDecl());
-
-  Stream.EmitRecord(bitc::METADATA_MODULE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDITemplateTypeParameter(
-    const DITemplateTypeParameter *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getType()));
-  Record.push_back(N->isDefault());
-
-  Stream.EmitRecord(bitc::METADATA_TEMPLATE_TYPE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDITemplateValueParameter(
-    const DITemplateValueParameter *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(N->getTag());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getType()));
-  Record.push_back(N->isDefault());
-  Record.push_back(VE.getMetadataOrNullID(N->getValue()));
-
-  Stream.EmitRecord(bitc::METADATA_TEMPLATE_VALUE, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIGlobalVariable(
-    const DIGlobalVariable *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  const uint64_t Version = 2 << 1;
-  Record.push_back((uint64_t)N->isDistinct() | Version);
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getType()));
-  Record.push_back(N->isLocalToUnit());
-  Record.push_back(N->isDefinition());
-  Record.push_back(VE.getMetadataOrNullID(N->getStaticDataMemberDeclaration()));
-  Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams()));
-  Record.push_back(N->getAlignInBits());
-
-  Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDILocalVariable(
-    const DILocalVariable *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  // In order to support all possible bitcode formats in BitcodeReader we need
-  // to distinguish the following cases:
-  // 1) Record has no artificial tag (Record[1]),
-  //   has no obsolete inlinedAt field (Record[9]).
-  //   In this case Record size will be 8, HasAlignment flag is false.
-  // 2) Record has artificial tag (Record[1]),
-  //   has no obsolete inlignedAt field (Record[9]).
-  //   In this case Record size will be 9, HasAlignment flag is false.
-  // 3) Record has both artificial tag (Record[1]) and
-  //   obsolete inlignedAt field (Record[9]).
-  //   In this case Record size will be 10, HasAlignment flag is false.
-  // 4) Record has neither artificial tag, nor inlignedAt field, but
-  //   HasAlignment flag is true and Record[8] contains alignment value.
-  const uint64_t HasAlignmentFlag = 1 << 1;
-  Record.push_back((uint64_t)N->isDistinct() | HasAlignmentFlag);
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getType()));
-  Record.push_back(N->getArg());
-  Record.push_back(N->getFlags());
-  Record.push_back(N->getAlignInBits());
-
-  Stream.EmitRecord(bitc::METADATA_LOCAL_VAR, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDILabel(
-    const DILabel *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  Record.push_back((uint64_t)N->isDistinct());
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getLine());
-
-  Stream.EmitRecord(bitc::METADATA_LABEL, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIExpression(const DIExpression *N,
-                                            SmallVectorImpl<uint64_t> &Record,
-                                            unsigned Abbrev) {
-  Record.reserve(N->getElements().size() + 1);
-  const uint64_t Version = 3 << 1;
-  Record.push_back((uint64_t)N->isDistinct() | Version);
-  Record.append(N->elements_begin(), N->elements_end());
-
-  Stream.EmitRecord(bitc::METADATA_EXPRESSION, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIGlobalVariableExpression(
-    const DIGlobalVariableExpression *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(VE.getMetadataOrNullID(N->getVariable()));
-  Record.push_back(VE.getMetadataOrNullID(N->getExpression()));
-
-  Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR_EXPR, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIObjCProperty(const DIObjCProperty *N,
-                                              SmallVectorImpl<uint64_t> &Record,
-                                              unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
-  Record.push_back(N->getLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawSetterName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawGetterName()));
-  Record.push_back(N->getAttributes());
-  Record.push_back(VE.getMetadataOrNullID(N->getType()));
-
-  Stream.EmitRecord(bitc::METADATA_OBJC_PROPERTY, Record, Abbrev);
-  Record.clear();
-}
-
-void ModuleBitcodeWriter::writeDIImportedEntity(
-    const DIImportedEntity *N, SmallVectorImpl<uint64_t> &Record,
-    unsigned Abbrev) {
-  Record.push_back(N->isDistinct());
-  Record.push_back(N->getTag());
-  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
-  Record.push_back(VE.getMetadataOrNullID(N->getEntity()));
-  Record.push_back(N->getLine());
-  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
-  Record.push_back(VE.getMetadataOrNullID(N->getRawFile()));
-
-  Stream.EmitRecord(bitc::METADATA_IMPORTED_ENTITY, Record, Abbrev);
-  Record.clear();
-}
-
-unsigned ModuleBitcodeWriter::createNamedMetadataAbbrev() {
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_NAME));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
-  return Stream.EmitAbbrev(std::move(Abbv));
-}
-
-void ModuleBitcodeWriter::writeNamedMetadata(
-    SmallVectorImpl<uint64_t> &Record) {
-  if (M.named_metadata_empty())
-    return;
-
-  unsigned Abbrev = createNamedMetadataAbbrev();
-  for (const NamedMDNode &NMD : M.named_metadata()) {
-    // Write name.
-    StringRef Str = NMD.getName();
-    Record.append(Str.bytes_begin(), Str.bytes_end());
-    Stream.EmitRecord(bitc::METADATA_NAME, Record, Abbrev);
-    Record.clear();
-
-    // Write named metadata operands.
-    for (const MDNode *N : NMD.operands())
-      Record.push_back(VE.getMetadataID(N));
-    Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
-    Record.clear();
-  }
-}
-
-unsigned ModuleBitcodeWriter::createMetadataStringsAbbrev() {
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRINGS));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of strings
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // offset to chars
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
-  return Stream.EmitAbbrev(std::move(Abbv));
-}
-
-/// Write out a record for MDString.
-///
-/// All the metadata strings in a metadata block are emitted in a single
-/// record.  The sizes and strings themselves are shoved into a blob.
-void ModuleBitcodeWriter::writeMetadataStrings(
-    ArrayRef<const Metadata *> Strings, SmallVectorImpl<uint64_t> &Record) {
-  if (Strings.empty())
-    return;
-
-  // Start the record with the number of strings.
-  Record.push_back(bitc::METADATA_STRINGS);
-  Record.push_back(Strings.size());
-
-  // Emit the sizes of the strings in the blob.
-  SmallString<256> Blob;
-  {
-    BitstreamWriter W(Blob);
-    for (const Metadata *MD : Strings)
-      W.EmitVBR(cast<MDString>(MD)->getLength(), 6);
-    W.FlushToWord();
-  }
-
-  // Add the offset to the strings to the record.
-  Record.push_back(Blob.size());
-
-  // Add the strings to the blob.
-  for (const Metadata *MD : Strings)
-    Blob.append(cast<MDString>(MD)->getString());
-
-  // Emit the final record.
-  Stream.EmitRecordWithBlob(createMetadataStringsAbbrev(), Record, Blob);
-  Record.clear();
-}
-
-// Generates an enum to use as an index in the Abbrev array of Metadata record.
-enum MetadataAbbrev : unsigned {
-#define HANDLE_MDNODE_LEAF(CLASS) CLASS##AbbrevID,
-#include "llvm/IR/Metadata.def"
-  LastPlusOne
-};
-
-void ModuleBitcodeWriter::writeMetadataRecords(
-    ArrayRef<const Metadata *> MDs, SmallVectorImpl<uint64_t> &Record,
-    std::vector<unsigned> *MDAbbrevs, std::vector<uint64_t> *IndexPos) {
-  if (MDs.empty())
-    return;
-
-  // Initialize MDNode abbreviations.
-#define HANDLE_MDNODE_LEAF(CLASS) unsigned CLASS##Abbrev = 0;
-#include "llvm/IR/Metadata.def"
-
-  for (const Metadata *MD : MDs) {
-    if (IndexPos)
-      IndexPos->push_back(Stream.GetCurrentBitNo());
-    if (const MDNode *N = dyn_cast<MDNode>(MD)) {
-      assert(N->isResolved() && "Expected forward references to be resolved");
-
-      switch (N->getMetadataID()) {
-      default:
-        llvm_unreachable("Invalid MDNode subclass");
-#define HANDLE_MDNODE_LEAF(CLASS)                                              \
-  case Metadata::CLASS##Kind:                                                  \
-    if (MDAbbrevs)                                                             \
-      write##CLASS(cast<CLASS>(N), Record,                                     \
-                   (*MDAbbrevs)[MetadataAbbrev::CLASS##AbbrevID]);             \
-    else                                                                       \
-      write##CLASS(cast<CLASS>(N), Record, CLASS##Abbrev);                     \
-    continue;
-#include "llvm/IR/Metadata.def"
-      }
-    }
-    writeValueAsMetadata(cast<ValueAsMetadata>(MD), Record);
-  }
-}
-
-void ModuleBitcodeWriter::writeModuleMetadata() {
-  if (!VE.hasMDs() && M.named_metadata_empty())
-    return;
-
-  Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 4);
-  SmallVector<uint64_t, 64> Record;
-
-  // Emit all abbrevs upfront, so that the reader can jump in the middle of the
-  // block and load any metadata.
-  std::vector<unsigned> MDAbbrevs;
-
-  MDAbbrevs.resize(MetadataAbbrev::LastPlusOne);
-  MDAbbrevs[MetadataAbbrev::DILocationAbbrevID] = createDILocationAbbrev();
-  MDAbbrevs[MetadataAbbrev::GenericDINodeAbbrevID] =
-      createGenericDINodeAbbrev();
-
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX_OFFSET));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  unsigned OffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  unsigned IndexAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Emit MDStrings together upfront.
-  writeMetadataStrings(VE.getMDStrings(), Record);
-
-  // We only emit an index for the metadata record if we have more than a given
-  // (naive) threshold of metadatas, otherwise it is not worth it.
-  if (VE.getNonMDStrings().size() > IndexThreshold) {
-    // Write a placeholder value in for the offset of the metadata index,
-    // which is written after the records, so that it can include
-    // the offset of each entry. The placeholder offset will be
-    // updated after all records are emitted.
-    uint64_t Vals[] = {0, 0};
-    Stream.EmitRecord(bitc::METADATA_INDEX_OFFSET, Vals, OffsetAbbrev);
-  }
-
-  // Compute and save the bit offset to the current position, which will be
-  // patched when we emit the index later. We can simply subtract the 64-bit
-  // fixed size from the current bit number to get the location to backpatch.
-  uint64_t IndexOffsetRecordBitPos = Stream.GetCurrentBitNo();
-
-  // This index will contain the bitpos for each individual record.
-  std::vector<uint64_t> IndexPos;
-  IndexPos.reserve(VE.getNonMDStrings().size());
-
-  // Write all the records
-  writeMetadataRecords(VE.getNonMDStrings(), Record, &MDAbbrevs, &IndexPos);
-
-  if (VE.getNonMDStrings().size() > IndexThreshold) {
-    // Now that we have emitted all the records we will emit the index. But
-    // first
-    // backpatch the forward reference so that the reader can skip the records
-    // efficiently.
-    Stream.BackpatchWord64(IndexOffsetRecordBitPos - 64,
-                           Stream.GetCurrentBitNo() - IndexOffsetRecordBitPos);
-
-    // Delta encode the index.
-    uint64_t PreviousValue = IndexOffsetRecordBitPos;
-    for (auto &Elt : IndexPos) {
-      auto EltDelta = Elt - PreviousValue;
-      PreviousValue = Elt;
-      Elt = EltDelta;
-    }
-    // Emit the index record.
-    Stream.EmitRecord(bitc::METADATA_INDEX, IndexPos, IndexAbbrev);
-    IndexPos.clear();
-  }
-
-  // Write the named metadata now.
-  writeNamedMetadata(Record);
-
-  auto AddDeclAttachedMetadata = [&](const GlobalObject &GO) {
-    SmallVector<uint64_t, 4> Record;
-    Record.push_back(VE.getValueID(&GO));
-    pushGlobalMetadataAttachment(Record, GO);
-    Stream.EmitRecord(bitc::METADATA_GLOBAL_DECL_ATTACHMENT, Record);
-  };
-  for (const Function &F : M)
-    if (F.isDeclaration() && F.hasMetadata())
-      AddDeclAttachedMetadata(F);
-  // FIXME: Only store metadata for declarations here, and move data for global
-  // variable definitions to a separate block (PR28134).
-  for (const GlobalVariable &GV : M.globals())
-    if (GV.hasMetadata())
-      AddDeclAttachedMetadata(GV);
-
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::writeFunctionMetadata(const Function &F) {
-  if (!VE.hasMDs())
-    return;
-
-  Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
-  SmallVector<uint64_t, 64> Record;
-  writeMetadataStrings(VE.getMDStrings(), Record);
-  writeMetadataRecords(VE.getNonMDStrings(), Record);
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::pushGlobalMetadataAttachment(
-    SmallVectorImpl<uint64_t> &Record, const GlobalObject &GO) {
-  // [n x [id, mdnode]]
-  SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
-  GO.getAllMetadata(MDs);
-  for (const auto &I : MDs) {
-    Record.push_back(I.first);
-    Record.push_back(VE.getMetadataID(I.second));
-  }
-}
-
-void ModuleBitcodeWriter::writeFunctionMetadataAttachment(const Function &F) {
-  Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
-
-  SmallVector<uint64_t, 64> Record;
-
-  if (F.hasMetadata()) {
-    pushGlobalMetadataAttachment(Record, F);
-    Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
-    Record.clear();
-  }
-
-  // Write metadata attachments
-  // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
-  SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
-  for (const BasicBlock &BB : F)
-    for (const Instruction &I : BB) {
-      MDs.clear();
-      I.getAllMetadataOtherThanDebugLoc(MDs);
-
-      // If no metadata, ignore instruction.
-      if (MDs.empty()) continue;
-
-      Record.push_back(VE.getInstructionID(&I));
-
-      for (unsigned i = 0, e = MDs.size(); i != e; ++i) {
-        Record.push_back(MDs[i].first);
-        Record.push_back(VE.getMetadataID(MDs[i].second));
-      }
-      Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
-      Record.clear();
-    }
-
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::writeModuleMetadataKinds() {
-  SmallVector<uint64_t, 64> Record;
-
-  // Write metadata kinds
-  // METADATA_KIND - [n x [id, name]]
-  SmallVector<StringRef, 8> Names;
-  M.getMDKindNames(Names);
-
-  if (Names.empty()) return;
-
-  Stream.EnterSubblock(bitc::METADATA_KIND_BLOCK_ID, 3);
-
-  for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
-    Record.push_back(MDKindID);
-    StringRef KName = Names[MDKindID];
-    Record.append(KName.begin(), KName.end());
-
-    Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
-    Record.clear();
-  }
-
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::writeOperandBundleTags() {
-  // Write metadata kinds
-  //
-  // OPERAND_BUNDLE_TAGS_BLOCK_ID : N x OPERAND_BUNDLE_TAG
-  //
-  // OPERAND_BUNDLE_TAG - [strchr x N]
-
-  SmallVector<StringRef, 8> Tags;
-  M.getOperandBundleTags(Tags);
-
-  if (Tags.empty())
-    return;
-
-  Stream.EnterSubblock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID, 3);
-
-  SmallVector<uint64_t, 64> Record;
-
-  for (auto Tag : Tags) {
-    Record.append(Tag.begin(), Tag.end());
-
-    Stream.EmitRecord(bitc::OPERAND_BUNDLE_TAG, Record, 0);
-    Record.clear();
-  }
-
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::writeSyncScopeNames() {
-  SmallVector<StringRef, 8> SSNs;
-  M.getContext().getSyncScopeNames(SSNs);
-  if (SSNs.empty())
-    return;
-
-  Stream.EnterSubblock(bitc::SYNC_SCOPE_NAMES_BLOCK_ID, 2);
-
-  SmallVector<uint64_t, 64> Record;
-  for (auto SSN : SSNs) {
-    Record.append(SSN.begin(), SSN.end());
-    Stream.EmitRecord(bitc::SYNC_SCOPE_NAME, Record, 0);
-    Record.clear();
-  }
-
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::writeConstants(unsigned FirstVal, unsigned LastVal,
-                                         bool isGlobal) {
-  if (FirstVal == LastVal) return;
-
-  Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
-
-  unsigned AggregateAbbrev = 0;
-  unsigned String8Abbrev = 0;
-  unsigned CString7Abbrev = 0;
-  unsigned CString6Abbrev = 0;
-  // If this is a constant pool for the module, emit module-specific abbrevs.
-  if (isGlobal) {
-    // Abbrev for CST_CODE_AGGREGATE.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
-    AggregateAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-    // Abbrev for CST_CODE_STRING.
-    Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
-    String8Abbrev = Stream.EmitAbbrev(std::move(Abbv));
-    // Abbrev for CST_CODE_CSTRING.
-    Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
-    CString7Abbrev = Stream.EmitAbbrev(std::move(Abbv));
-    // Abbrev for CST_CODE_CSTRING.
-    Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-    CString6Abbrev = Stream.EmitAbbrev(std::move(Abbv));
-  }
-
-  SmallVector<uint64_t, 64> Record;
-
-  const ValueEnumerator::ValueList &Vals = VE.getValues();
-  Type *LastTy = nullptr;
-  for (unsigned i = FirstVal; i != LastVal; ++i) {
-    const Value *V = Vals[i].first;
-    // If we need to switch types, do so now.
-    if (V->getType() != LastTy) {
-      LastTy = V->getType();
-      Record.push_back(VE.getTypeID(LastTy));
-      Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
-                        CONSTANTS_SETTYPE_ABBREV);
-      Record.clear();
-    }
-
-    if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
-      Record.push_back(unsigned(IA->hasSideEffects()) |
-                       unsigned(IA->isAlignStack()) << 1 |
-                       unsigned(IA->getDialect()&1) << 2);
-
-      // Add the asm string.
-      const std::string &AsmStr = IA->getAsmString();
-      Record.push_back(AsmStr.size());
-      Record.append(AsmStr.begin(), AsmStr.end());
-
-      // Add the constraint string.
-      const std::string &ConstraintStr = IA->getConstraintString();
-      Record.push_back(ConstraintStr.size());
-      Record.append(ConstraintStr.begin(), ConstraintStr.end());
-      Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
-      Record.clear();
-      continue;
-    }
-    const Constant *C = cast<Constant>(V);
-    unsigned Code = -1U;
-    unsigned AbbrevToUse = 0;
-    if (C->isNullValue()) {
-      Code = bitc::CST_CODE_NULL;
+ 
+  Stream.EmitRecord(bitc::METADATA_MODULE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDITemplateTypeParameter( 
+    const DITemplateTypeParameter *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getType())); 
+  Record.push_back(N->isDefault()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_TEMPLATE_TYPE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDITemplateValueParameter( 
+    const DITemplateValueParameter *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(N->getTag()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getType())); 
+  Record.push_back(N->isDefault()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getValue())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_TEMPLATE_VALUE, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIGlobalVariable( 
+    const DIGlobalVariable *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  const uint64_t Version = 2 << 1; 
+  Record.push_back((uint64_t)N->isDistinct() | Version); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawLinkageName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getType())); 
+  Record.push_back(N->isLocalToUnit()); 
+  Record.push_back(N->isDefinition()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getStaticDataMemberDeclaration())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams())); 
+  Record.push_back(N->getAlignInBits()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDILocalVariable( 
+    const DILocalVariable *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  // In order to support all possible bitcode formats in BitcodeReader we need 
+  // to distinguish the following cases: 
+  // 1) Record has no artificial tag (Record[1]), 
+  //   has no obsolete inlinedAt field (Record[9]). 
+  //   In this case Record size will be 8, HasAlignment flag is false. 
+  // 2) Record has artificial tag (Record[1]), 
+  //   has no obsolete inlignedAt field (Record[9]). 
+  //   In this case Record size will be 9, HasAlignment flag is false. 
+  // 3) Record has both artificial tag (Record[1]) and 
+  //   obsolete inlignedAt field (Record[9]). 
+  //   In this case Record size will be 10, HasAlignment flag is false. 
+  // 4) Record has neither artificial tag, nor inlignedAt field, but 
+  //   HasAlignment flag is true and Record[8] contains alignment value. 
+  const uint64_t HasAlignmentFlag = 1 << 1; 
+  Record.push_back((uint64_t)N->isDistinct() | HasAlignmentFlag); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getType())); 
+  Record.push_back(N->getArg()); 
+  Record.push_back(N->getFlags()); 
+  Record.push_back(N->getAlignInBits()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_LOCAL_VAR, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDILabel( 
+    const DILabel *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  Record.push_back((uint64_t)N->isDistinct()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getLine()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_LABEL, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIExpression(const DIExpression *N, 
+                                            SmallVectorImpl<uint64_t> &Record, 
+                                            unsigned Abbrev) { 
+  Record.reserve(N->getElements().size() + 1); 
+  const uint64_t Version = 3 << 1; 
+  Record.push_back((uint64_t)N->isDistinct() | Version); 
+  Record.append(N->elements_begin(), N->elements_end()); 
+ 
+  Stream.EmitRecord(bitc::METADATA_EXPRESSION, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIGlobalVariableExpression( 
+    const DIGlobalVariableExpression *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getVariable())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getExpression())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR_EXPR, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIObjCProperty(const DIObjCProperty *N, 
+                                              SmallVectorImpl<uint64_t> &Record, 
+                                              unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getFile())); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawSetterName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawGetterName())); 
+  Record.push_back(N->getAttributes()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getType())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_OBJC_PROPERTY, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+void ModuleBitcodeWriter::writeDIImportedEntity( 
+    const DIImportedEntity *N, SmallVectorImpl<uint64_t> &Record, 
+    unsigned Abbrev) { 
+  Record.push_back(N->isDistinct()); 
+  Record.push_back(N->getTag()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getScope())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getEntity())); 
+  Record.push_back(N->getLine()); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName())); 
+  Record.push_back(VE.getMetadataOrNullID(N->getRawFile())); 
+ 
+  Stream.EmitRecord(bitc::METADATA_IMPORTED_ENTITY, Record, Abbrev); 
+  Record.clear(); 
+} 
+ 
+unsigned ModuleBitcodeWriter::createNamedMetadataAbbrev() { 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_NAME)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 
+  return Stream.EmitAbbrev(std::move(Abbv)); 
+} 
+ 
+void ModuleBitcodeWriter::writeNamedMetadata( 
+    SmallVectorImpl<uint64_t> &Record) { 
+  if (M.named_metadata_empty()) 
+    return; 
+ 
+  unsigned Abbrev = createNamedMetadataAbbrev(); 
+  for (const NamedMDNode &NMD : M.named_metadata()) { 
+    // Write name. 
+    StringRef Str = NMD.getName(); 
+    Record.append(Str.bytes_begin(), Str.bytes_end()); 
+    Stream.EmitRecord(bitc::METADATA_NAME, Record, Abbrev); 
+    Record.clear(); 
+ 
+    // Write named metadata operands. 
+    for (const MDNode *N : NMD.operands()) 
+      Record.push_back(VE.getMetadataID(N)); 
+    Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0); 
+    Record.clear(); 
+  } 
+} 
+ 
+unsigned ModuleBitcodeWriter::createMetadataStringsAbbrev() { 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_STRINGS)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of strings 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // offset to chars 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); 
+  return Stream.EmitAbbrev(std::move(Abbv)); 
+} 
+ 
+/// Write out a record for MDString. 
+/// 
+/// All the metadata strings in a metadata block are emitted in a single 
+/// record.  The sizes and strings themselves are shoved into a blob. 
+void ModuleBitcodeWriter::writeMetadataStrings( 
+    ArrayRef<const Metadata *> Strings, SmallVectorImpl<uint64_t> &Record) { 
+  if (Strings.empty()) 
+    return; 
+ 
+  // Start the record with the number of strings. 
+  Record.push_back(bitc::METADATA_STRINGS); 
+  Record.push_back(Strings.size()); 
+ 
+  // Emit the sizes of the strings in the blob. 
+  SmallString<256> Blob; 
+  { 
+    BitstreamWriter W(Blob); 
+    for (const Metadata *MD : Strings) 
+      W.EmitVBR(cast<MDString>(MD)->getLength(), 6); 
+    W.FlushToWord(); 
+  } 
+ 
+  // Add the offset to the strings to the record. 
+  Record.push_back(Blob.size()); 
+ 
+  // Add the strings to the blob. 
+  for (const Metadata *MD : Strings) 
+    Blob.append(cast<MDString>(MD)->getString()); 
+ 
+  // Emit the final record. 
+  Stream.EmitRecordWithBlob(createMetadataStringsAbbrev(), Record, Blob); 
+  Record.clear(); 
+} 
+ 
+// Generates an enum to use as an index in the Abbrev array of Metadata record. 
+enum MetadataAbbrev : unsigned { 
+#define HANDLE_MDNODE_LEAF(CLASS) CLASS##AbbrevID, 
+#include "llvm/IR/Metadata.def" 
+  LastPlusOne 
+}; 
+ 
+void ModuleBitcodeWriter::writeMetadataRecords( 
+    ArrayRef<const Metadata *> MDs, SmallVectorImpl<uint64_t> &Record, 
+    std::vector<unsigned> *MDAbbrevs, std::vector<uint64_t> *IndexPos) { 
+  if (MDs.empty()) 
+    return; 
+ 
+  // Initialize MDNode abbreviations. 
+#define HANDLE_MDNODE_LEAF(CLASS) unsigned CLASS##Abbrev = 0; 
+#include "llvm/IR/Metadata.def" 
+ 
+  for (const Metadata *MD : MDs) { 
+    if (IndexPos) 
+      IndexPos->push_back(Stream.GetCurrentBitNo()); 
+    if (const MDNode *N = dyn_cast<MDNode>(MD)) { 
+      assert(N->isResolved() && "Expected forward references to be resolved"); 
+ 
+      switch (N->getMetadataID()) { 
+      default: 
+        llvm_unreachable("Invalid MDNode subclass"); 
+#define HANDLE_MDNODE_LEAF(CLASS)                                              \ 
+  case Metadata::CLASS##Kind:                                                  \ 
+    if (MDAbbrevs)                                                             \ 
+      write##CLASS(cast<CLASS>(N), Record,                                     \ 
+                   (*MDAbbrevs)[MetadataAbbrev::CLASS##AbbrevID]);             \ 
+    else                                                                       \ 
+      write##CLASS(cast<CLASS>(N), Record, CLASS##Abbrev);                     \ 
+    continue; 
+#include "llvm/IR/Metadata.def" 
+      } 
+    } 
+    writeValueAsMetadata(cast<ValueAsMetadata>(MD), Record); 
+  } 
+} 
+ 
+void ModuleBitcodeWriter::writeModuleMetadata() { 
+  if (!VE.hasMDs() && M.named_metadata_empty()) 
+    return; 
+ 
+  Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 4); 
+  SmallVector<uint64_t, 64> Record; 
+ 
+  // Emit all abbrevs upfront, so that the reader can jump in the middle of the 
+  // block and load any metadata. 
+  std::vector<unsigned> MDAbbrevs; 
+ 
+  MDAbbrevs.resize(MetadataAbbrev::LastPlusOne); 
+  MDAbbrevs[MetadataAbbrev::DILocationAbbrevID] = createDILocationAbbrev(); 
+  MDAbbrevs[MetadataAbbrev::GenericDINodeAbbrevID] = 
+      createGenericDINodeAbbrev(); 
+ 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX_OFFSET)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); 
+  unsigned OffsetAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_INDEX)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 
+  unsigned IndexAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Emit MDStrings together upfront. 
+  writeMetadataStrings(VE.getMDStrings(), Record); 
+ 
+  // We only emit an index for the metadata record if we have more than a given 
+  // (naive) threshold of metadatas, otherwise it is not worth it. 
+  if (VE.getNonMDStrings().size() > IndexThreshold) { 
+    // Write a placeholder value in for the offset of the metadata index, 
+    // which is written after the records, so that it can include 
+    // the offset of each entry. The placeholder offset will be 
+    // updated after all records are emitted. 
+    uint64_t Vals[] = {0, 0}; 
+    Stream.EmitRecord(bitc::METADATA_INDEX_OFFSET, Vals, OffsetAbbrev); 
+  } 
+ 
+  // Compute and save the bit offset to the current position, which will be 
+  // patched when we emit the index later. We can simply subtract the 64-bit 
+  // fixed size from the current bit number to get the location to backpatch. 
+  uint64_t IndexOffsetRecordBitPos = Stream.GetCurrentBitNo(); 
+ 
+  // This index will contain the bitpos for each individual record. 
+  std::vector<uint64_t> IndexPos; 
+  IndexPos.reserve(VE.getNonMDStrings().size()); 
+ 
+  // Write all the records 
+  writeMetadataRecords(VE.getNonMDStrings(), Record, &MDAbbrevs, &IndexPos); 
+ 
+  if (VE.getNonMDStrings().size() > IndexThreshold) { 
+    // Now that we have emitted all the records we will emit the index. But 
+    // first 
+    // backpatch the forward reference so that the reader can skip the records 
+    // efficiently. 
+    Stream.BackpatchWord64(IndexOffsetRecordBitPos - 64, 
+                           Stream.GetCurrentBitNo() - IndexOffsetRecordBitPos); 
+ 
+    // Delta encode the index. 
+    uint64_t PreviousValue = IndexOffsetRecordBitPos; 
+    for (auto &Elt : IndexPos) { 
+      auto EltDelta = Elt - PreviousValue; 
+      PreviousValue = Elt; 
+      Elt = EltDelta; 
+    } 
+    // Emit the index record. 
+    Stream.EmitRecord(bitc::METADATA_INDEX, IndexPos, IndexAbbrev); 
+    IndexPos.clear(); 
+  } 
+ 
+  // Write the named metadata now. 
+  writeNamedMetadata(Record); 
+ 
+  auto AddDeclAttachedMetadata = [&](const GlobalObject &GO) { 
+    SmallVector<uint64_t, 4> Record; 
+    Record.push_back(VE.getValueID(&GO)); 
+    pushGlobalMetadataAttachment(Record, GO); 
+    Stream.EmitRecord(bitc::METADATA_GLOBAL_DECL_ATTACHMENT, Record); 
+  }; 
+  for (const Function &F : M) 
+    if (F.isDeclaration() && F.hasMetadata()) 
+      AddDeclAttachedMetadata(F); 
+  // FIXME: Only store metadata for declarations here, and move data for global 
+  // variable definitions to a separate block (PR28134). 
+  for (const GlobalVariable &GV : M.globals()) 
+    if (GV.hasMetadata()) 
+      AddDeclAttachedMetadata(GV); 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::writeFunctionMetadata(const Function &F) { 
+  if (!VE.hasMDs()) 
+    return; 
+ 
+  Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3); 
+  SmallVector<uint64_t, 64> Record; 
+  writeMetadataStrings(VE.getMDStrings(), Record); 
+  writeMetadataRecords(VE.getNonMDStrings(), Record); 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::pushGlobalMetadataAttachment( 
+    SmallVectorImpl<uint64_t> &Record, const GlobalObject &GO) { 
+  // [n x [id, mdnode]] 
+  SmallVector<std::pair<unsigned, MDNode *>, 4> MDs; 
+  GO.getAllMetadata(MDs); 
+  for (const auto &I : MDs) { 
+    Record.push_back(I.first); 
+    Record.push_back(VE.getMetadataID(I.second)); 
+  } 
+} 
+ 
+void ModuleBitcodeWriter::writeFunctionMetadataAttachment(const Function &F) { 
+  Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3); 
+ 
+  SmallVector<uint64_t, 64> Record; 
+ 
+  if (F.hasMetadata()) { 
+    pushGlobalMetadataAttachment(Record, F); 
+    Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0); 
+    Record.clear(); 
+  } 
+ 
+  // Write metadata attachments 
+  // METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]] 
+  SmallVector<std::pair<unsigned, MDNode *>, 4> MDs; 
+  for (const BasicBlock &BB : F) 
+    for (const Instruction &I : BB) { 
+      MDs.clear(); 
+      I.getAllMetadataOtherThanDebugLoc(MDs); 
+ 
+      // If no metadata, ignore instruction. 
+      if (MDs.empty()) continue; 
+ 
+      Record.push_back(VE.getInstructionID(&I)); 
+ 
+      for (unsigned i = 0, e = MDs.size(); i != e; ++i) { 
+        Record.push_back(MDs[i].first); 
+        Record.push_back(VE.getMetadataID(MDs[i].second)); 
+      } 
+      Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0); 
+      Record.clear(); 
+    } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::writeModuleMetadataKinds() { 
+  SmallVector<uint64_t, 64> Record; 
+ 
+  // Write metadata kinds 
+  // METADATA_KIND - [n x [id, name]] 
+  SmallVector<StringRef, 8> Names; 
+  M.getMDKindNames(Names); 
+ 
+  if (Names.empty()) return; 
+ 
+  Stream.EnterSubblock(bitc::METADATA_KIND_BLOCK_ID, 3); 
+ 
+  for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) { 
+    Record.push_back(MDKindID); 
+    StringRef KName = Names[MDKindID]; 
+    Record.append(KName.begin(), KName.end()); 
+ 
+    Stream.EmitRecord(bitc::METADATA_KIND, Record, 0); 
+    Record.clear(); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::writeOperandBundleTags() { 
+  // Write metadata kinds 
+  // 
+  // OPERAND_BUNDLE_TAGS_BLOCK_ID : N x OPERAND_BUNDLE_TAG 
+  // 
+  // OPERAND_BUNDLE_TAG - [strchr x N] 
+ 
+  SmallVector<StringRef, 8> Tags; 
+  M.getOperandBundleTags(Tags); 
+ 
+  if (Tags.empty()) 
+    return; 
+ 
+  Stream.EnterSubblock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID, 3); 
+ 
+  SmallVector<uint64_t, 64> Record; 
+ 
+  for (auto Tag : Tags) { 
+    Record.append(Tag.begin(), Tag.end()); 
+ 
+    Stream.EmitRecord(bitc::OPERAND_BUNDLE_TAG, Record, 0); 
+    Record.clear(); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::writeSyncScopeNames() { 
+  SmallVector<StringRef, 8> SSNs; 
+  M.getContext().getSyncScopeNames(SSNs); 
+  if (SSNs.empty()) 
+    return; 
+ 
+  Stream.EnterSubblock(bitc::SYNC_SCOPE_NAMES_BLOCK_ID, 2); 
+ 
+  SmallVector<uint64_t, 64> Record; 
+  for (auto SSN : SSNs) { 
+    Record.append(SSN.begin(), SSN.end()); 
+    Stream.EmitRecord(bitc::SYNC_SCOPE_NAME, Record, 0); 
+    Record.clear(); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::writeConstants(unsigned FirstVal, unsigned LastVal, 
+                                         bool isGlobal) { 
+  if (FirstVal == LastVal) return; 
+ 
+  Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4); 
+ 
+  unsigned AggregateAbbrev = 0; 
+  unsigned String8Abbrev = 0; 
+  unsigned CString7Abbrev = 0; 
+  unsigned CString6Abbrev = 0; 
+  // If this is a constant pool for the module, emit module-specific abbrevs. 
+  if (isGlobal) { 
+    // Abbrev for CST_CODE_AGGREGATE. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1))); 
+    AggregateAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+    // Abbrev for CST_CODE_STRING. 
+    Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 
+    String8Abbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+    // Abbrev for CST_CODE_CSTRING. 
+    Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 
+    CString7Abbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+    // Abbrev for CST_CODE_CSTRING. 
+    Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 
+    CString6Abbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+  } 
+ 
+  SmallVector<uint64_t, 64> Record; 
+ 
+  const ValueEnumerator::ValueList &Vals = VE.getValues(); 
+  Type *LastTy = nullptr; 
+  for (unsigned i = FirstVal; i != LastVal; ++i) { 
+    const Value *V = Vals[i].first; 
+    // If we need to switch types, do so now. 
+    if (V->getType() != LastTy) { 
+      LastTy = V->getType(); 
+      Record.push_back(VE.getTypeID(LastTy)); 
+      Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record, 
+                        CONSTANTS_SETTYPE_ABBREV); 
+      Record.clear(); 
+    } 
+ 
+    if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) { 
+      Record.push_back(unsigned(IA->hasSideEffects()) | 
+                       unsigned(IA->isAlignStack()) << 1 | 
+                       unsigned(IA->getDialect()&1) << 2); 
+ 
+      // Add the asm string. 
+      const std::string &AsmStr = IA->getAsmString(); 
+      Record.push_back(AsmStr.size()); 
+      Record.append(AsmStr.begin(), AsmStr.end()); 
+ 
+      // Add the constraint string. 
+      const std::string &ConstraintStr = IA->getConstraintString(); 
+      Record.push_back(ConstraintStr.size()); 
+      Record.append(ConstraintStr.begin(), ConstraintStr.end()); 
+      Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record); 
+      Record.clear(); 
+      continue; 
+    } 
+    const Constant *C = cast<Constant>(V); 
+    unsigned Code = -1U; 
+    unsigned AbbrevToUse = 0; 
+    if (C->isNullValue()) { 
+      Code = bitc::CST_CODE_NULL; 
     } else if (isa<PoisonValue>(C)) {
       Code = bitc::CST_CODE_POISON;
-    } else if (isa<UndefValue>(C)) {
-      Code = bitc::CST_CODE_UNDEF;
-    } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) {
-      if (IV->getBitWidth() <= 64) {
-        uint64_t V = IV->getSExtValue();
-        emitSignedInt64(Record, V);
-        Code = bitc::CST_CODE_INTEGER;
-        AbbrevToUse = CONSTANTS_INTEGER_ABBREV;
-      } else {                             // Wide integers, > 64 bits in size.
-        emitWideAPInt(Record, IV->getValue());
-        Code = bitc::CST_CODE_WIDE_INTEGER;
-      }
-    } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
-      Code = bitc::CST_CODE_FLOAT;
-      Type *Ty = CFP->getType();
-      if (Ty->isHalfTy() || Ty->isBFloatTy() || Ty->isFloatTy() ||
-          Ty->isDoubleTy()) {
-        Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
-      } else if (Ty->isX86_FP80Ty()) {
-        // api needed to prevent premature destruction
-        // bits are not in the same order as a normal i80 APInt, compensate.
-        APInt api = CFP->getValueAPF().bitcastToAPInt();
-        const uint64_t *p = api.getRawData();
-        Record.push_back((p[1] << 48) | (p[0] >> 16));
-        Record.push_back(p[0] & 0xffffLL);
-      } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) {
-        APInt api = CFP->getValueAPF().bitcastToAPInt();
-        const uint64_t *p = api.getRawData();
-        Record.push_back(p[0]);
-        Record.push_back(p[1]);
-      } else {
-        assert(0 && "Unknown FP type!");
-      }
-    } else if (isa<ConstantDataSequential>(C) &&
-               cast<ConstantDataSequential>(C)->isString()) {
-      const ConstantDataSequential *Str = cast<ConstantDataSequential>(C);
-      // Emit constant strings specially.
-      unsigned NumElts = Str->getNumElements();
-      // If this is a null-terminated string, use the denser CSTRING encoding.
-      if (Str->isCString()) {
-        Code = bitc::CST_CODE_CSTRING;
-        --NumElts;  // Don't encode the null, which isn't allowed by char6.
-      } else {
-        Code = bitc::CST_CODE_STRING;
-        AbbrevToUse = String8Abbrev;
-      }
-      bool isCStr7 = Code == bitc::CST_CODE_CSTRING;
-      bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING;
-      for (unsigned i = 0; i != NumElts; ++i) {
-        unsigned char V = Str->getElementAsInteger(i);
-        Record.push_back(V);
-        isCStr7 &= (V & 128) == 0;
-        if (isCStrChar6)
-          isCStrChar6 = BitCodeAbbrevOp::isChar6(V);
-      }
-
-      if (isCStrChar6)
-        AbbrevToUse = CString6Abbrev;
-      else if (isCStr7)
-        AbbrevToUse = CString7Abbrev;
-    } else if (const ConstantDataSequential *CDS =
-                  dyn_cast<ConstantDataSequential>(C)) {
-      Code = bitc::CST_CODE_DATA;
-      Type *EltTy = CDS->getElementType();
-      if (isa<IntegerType>(EltTy)) {
-        for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
-          Record.push_back(CDS->getElementAsInteger(i));
-      } else {
-        for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i)
-          Record.push_back(
-              CDS->getElementAsAPFloat(i).bitcastToAPInt().getLimitedValue());
-      }
-    } else if (isa<ConstantAggregate>(C)) {
-      Code = bitc::CST_CODE_AGGREGATE;
-      for (const Value *Op : C->operands())
-        Record.push_back(VE.getValueID(Op));
-      AbbrevToUse = AggregateAbbrev;
-    } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
-      switch (CE->getOpcode()) {
-      default:
-        if (Instruction::isCast(CE->getOpcode())) {
-          Code = bitc::CST_CODE_CE_CAST;
-          Record.push_back(getEncodedCastOpcode(CE->getOpcode()));
-          Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
-          Record.push_back(VE.getValueID(C->getOperand(0)));
-          AbbrevToUse = CONSTANTS_CE_CAST_Abbrev;
-        } else {
-          assert(CE->getNumOperands() == 2 && "Unknown constant expr!");
-          Code = bitc::CST_CODE_CE_BINOP;
-          Record.push_back(getEncodedBinaryOpcode(CE->getOpcode()));
-          Record.push_back(VE.getValueID(C->getOperand(0)));
-          Record.push_back(VE.getValueID(C->getOperand(1)));
-          uint64_t Flags = getOptimizationFlags(CE);
-          if (Flags != 0)
-            Record.push_back(Flags);
-        }
-        break;
-      case Instruction::FNeg: {
-        assert(CE->getNumOperands() == 1 && "Unknown constant expr!");
-        Code = bitc::CST_CODE_CE_UNOP;
-        Record.push_back(getEncodedUnaryOpcode(CE->getOpcode()));
-        Record.push_back(VE.getValueID(C->getOperand(0)));
-        uint64_t Flags = getOptimizationFlags(CE);
-        if (Flags != 0)
-          Record.push_back(Flags);
-        break;
-      }
-      case Instruction::GetElementPtr: {
-        Code = bitc::CST_CODE_CE_GEP;
-        const auto *GO = cast<GEPOperator>(C);
-        Record.push_back(VE.getTypeID(GO->getSourceElementType()));
-        if (Optional<unsigned> Idx = GO->getInRangeIndex()) {
-          Code = bitc::CST_CODE_CE_GEP_WITH_INRANGE_INDEX;
-          Record.push_back((*Idx << 1) | GO->isInBounds());
-        } else if (GO->isInBounds())
-          Code = bitc::CST_CODE_CE_INBOUNDS_GEP;
-        for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) {
-          Record.push_back(VE.getTypeID(C->getOperand(i)->getType()));
-          Record.push_back(VE.getValueID(C->getOperand(i)));
-        }
-        break;
-      }
-      case Instruction::Select:
-        Code = bitc::CST_CODE_CE_SELECT;
-        Record.push_back(VE.getValueID(C->getOperand(0)));
-        Record.push_back(VE.getValueID(C->getOperand(1)));
-        Record.push_back(VE.getValueID(C->getOperand(2)));
-        break;
-      case Instruction::ExtractElement:
-        Code = bitc::CST_CODE_CE_EXTRACTELT;
-        Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
-        Record.push_back(VE.getValueID(C->getOperand(0)));
-        Record.push_back(VE.getTypeID(C->getOperand(1)->getType()));
-        Record.push_back(VE.getValueID(C->getOperand(1)));
-        break;
-      case Instruction::InsertElement:
-        Code = bitc::CST_CODE_CE_INSERTELT;
-        Record.push_back(VE.getValueID(C->getOperand(0)));
-        Record.push_back(VE.getValueID(C->getOperand(1)));
-        Record.push_back(VE.getTypeID(C->getOperand(2)->getType()));
-        Record.push_back(VE.getValueID(C->getOperand(2)));
-        break;
-      case Instruction::ShuffleVector:
-        // If the return type and argument types are the same, this is a
-        // standard shufflevector instruction.  If the types are different,
-        // then the shuffle is widening or truncating the input vectors, and
-        // the argument type must also be encoded.
-        if (C->getType() == C->getOperand(0)->getType()) {
-          Code = bitc::CST_CODE_CE_SHUFFLEVEC;
-        } else {
-          Code = bitc::CST_CODE_CE_SHUFVEC_EX;
-          Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
-        }
-        Record.push_back(VE.getValueID(C->getOperand(0)));
-        Record.push_back(VE.getValueID(C->getOperand(1)));
-        Record.push_back(VE.getValueID(CE->getShuffleMaskForBitcode()));
-        break;
-      case Instruction::ICmp:
-      case Instruction::FCmp:
-        Code = bitc::CST_CODE_CE_CMP;
-        Record.push_back(VE.getTypeID(C->getOperand(0)->getType()));
-        Record.push_back(VE.getValueID(C->getOperand(0)));
-        Record.push_back(VE.getValueID(C->getOperand(1)));
-        Record.push_back(CE->getPredicate());
-        break;
-      }
-    } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
-      Code = bitc::CST_CODE_BLOCKADDRESS;
-      Record.push_back(VE.getTypeID(BA->getFunction()->getType()));
-      Record.push_back(VE.getValueID(BA->getFunction()));
-      Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock()));
-    } else {
-#ifndef NDEBUG
-      C->dump();
-#endif
-      llvm_unreachable("Unknown constant!");
-    }
-    Stream.EmitRecord(Code, Record, AbbrevToUse);
-    Record.clear();
-  }
-
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::writeModuleConstants() {
-  const ValueEnumerator::ValueList &Vals = VE.getValues();
-
-  // Find the first constant to emit, which is the first non-globalvalue value.
-  // We know globalvalues have been emitted by WriteModuleInfo.
-  for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
-    if (!isa<GlobalValue>(Vals[i].first)) {
-      writeConstants(i, Vals.size(), true);
-      return;
-    }
-  }
-}
-
-/// pushValueAndType - The file has to encode both the value and type id for
-/// many values, because we need to know what type to create for forward
-/// references.  However, most operands are not forward references, so this type
-/// field is not needed.
-///
-/// This function adds V's value ID to Vals.  If the value ID is higher than the
-/// instruction ID, then it is a forward reference, and it also includes the
-/// type ID.  The value ID that is written is encoded relative to the InstID.
-bool ModuleBitcodeWriter::pushValueAndType(const Value *V, unsigned InstID,
-                                           SmallVectorImpl<unsigned> &Vals) {
-  unsigned ValID = VE.getValueID(V);
-  // Make encoding relative to the InstID.
-  Vals.push_back(InstID - ValID);
-  if (ValID >= InstID) {
-    Vals.push_back(VE.getTypeID(V->getType()));
-    return true;
-  }
-  return false;
-}
-
-void ModuleBitcodeWriter::writeOperandBundles(const CallBase &CS,
-                                              unsigned InstID) {
-  SmallVector<unsigned, 64> Record;
-  LLVMContext &C = CS.getContext();
-
-  for (unsigned i = 0, e = CS.getNumOperandBundles(); i != e; ++i) {
-    const auto &Bundle = CS.getOperandBundleAt(i);
-    Record.push_back(C.getOperandBundleTagID(Bundle.getTagName()));
-
-    for (auto &Input : Bundle.Inputs)
-      pushValueAndType(Input, InstID, Record);
-
-    Stream.EmitRecord(bitc::FUNC_CODE_OPERAND_BUNDLE, Record);
-    Record.clear();
-  }
-}
-
-/// pushValue - Like pushValueAndType, but where the type of the value is
-/// omitted (perhaps it was already encoded in an earlier operand).
-void ModuleBitcodeWriter::pushValue(const Value *V, unsigned InstID,
-                                    SmallVectorImpl<unsigned> &Vals) {
-  unsigned ValID = VE.getValueID(V);
-  Vals.push_back(InstID - ValID);
-}
-
-void ModuleBitcodeWriter::pushValueSigned(const Value *V, unsigned InstID,
-                                          SmallVectorImpl<uint64_t> &Vals) {
-  unsigned ValID = VE.getValueID(V);
-  int64_t diff = ((int32_t)InstID - (int32_t)ValID);
-  emitSignedInt64(Vals, diff);
-}
-
-/// WriteInstruction - Emit an instruction to the specified stream.
-void ModuleBitcodeWriter::writeInstruction(const Instruction &I,
-                                           unsigned InstID,
-                                           SmallVectorImpl<unsigned> &Vals) {
-  unsigned Code = 0;
-  unsigned AbbrevToUse = 0;
-  VE.setInstructionID(&I);
-  switch (I.getOpcode()) {
-  default:
-    if (Instruction::isCast(I.getOpcode())) {
-      Code = bitc::FUNC_CODE_INST_CAST;
-      if (!pushValueAndType(I.getOperand(0), InstID, Vals))
-        AbbrevToUse = FUNCTION_INST_CAST_ABBREV;
-      Vals.push_back(VE.getTypeID(I.getType()));
-      Vals.push_back(getEncodedCastOpcode(I.getOpcode()));
-    } else {
-      assert(isa<BinaryOperator>(I) && "Unknown instruction!");
-      Code = bitc::FUNC_CODE_INST_BINOP;
-      if (!pushValueAndType(I.getOperand(0), InstID, Vals))
-        AbbrevToUse = FUNCTION_INST_BINOP_ABBREV;
-      pushValue(I.getOperand(1), InstID, Vals);
-      Vals.push_back(getEncodedBinaryOpcode(I.getOpcode()));
-      uint64_t Flags = getOptimizationFlags(&I);
-      if (Flags != 0) {
-        if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV)
-          AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV;
-        Vals.push_back(Flags);
-      }
-    }
-    break;
-  case Instruction::FNeg: {
-    Code = bitc::FUNC_CODE_INST_UNOP;
-    if (!pushValueAndType(I.getOperand(0), InstID, Vals))
-      AbbrevToUse = FUNCTION_INST_UNOP_ABBREV;
-    Vals.push_back(getEncodedUnaryOpcode(I.getOpcode()));
-    uint64_t Flags = getOptimizationFlags(&I);
-    if (Flags != 0) {
-      if (AbbrevToUse == FUNCTION_INST_UNOP_ABBREV)
-        AbbrevToUse = FUNCTION_INST_UNOP_FLAGS_ABBREV;
-      Vals.push_back(Flags);
-    }
-    break;
-  }
-  case Instruction::GetElementPtr: {
-    Code = bitc::FUNC_CODE_INST_GEP;
-    AbbrevToUse = FUNCTION_INST_GEP_ABBREV;
-    auto &GEPInst = cast<GetElementPtrInst>(I);
-    Vals.push_back(GEPInst.isInBounds());
-    Vals.push_back(VE.getTypeID(GEPInst.getSourceElementType()));
-    for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
-      pushValueAndType(I.getOperand(i), InstID, Vals);
-    break;
-  }
-  case Instruction::ExtractValue: {
-    Code = bitc::FUNC_CODE_INST_EXTRACTVAL;
-    pushValueAndType(I.getOperand(0), InstID, Vals);
-    const ExtractValueInst *EVI = cast<ExtractValueInst>(&I);
-    Vals.append(EVI->idx_begin(), EVI->idx_end());
-    break;
-  }
-  case Instruction::InsertValue: {
-    Code = bitc::FUNC_CODE_INST_INSERTVAL;
-    pushValueAndType(I.getOperand(0), InstID, Vals);
-    pushValueAndType(I.getOperand(1), InstID, Vals);
-    const InsertValueInst *IVI = cast<InsertValueInst>(&I);
-    Vals.append(IVI->idx_begin(), IVI->idx_end());
-    break;
-  }
-  case Instruction::Select: {
-    Code = bitc::FUNC_CODE_INST_VSELECT;
-    pushValueAndType(I.getOperand(1), InstID, Vals);
-    pushValue(I.getOperand(2), InstID, Vals);
-    pushValueAndType(I.getOperand(0), InstID, Vals);
-    uint64_t Flags = getOptimizationFlags(&I);
-    if (Flags != 0)
-      Vals.push_back(Flags);
-    break;
-  }
-  case Instruction::ExtractElement:
-    Code = bitc::FUNC_CODE_INST_EXTRACTELT;
-    pushValueAndType(I.getOperand(0), InstID, Vals);
-    pushValueAndType(I.getOperand(1), InstID, Vals);
-    break;
-  case Instruction::InsertElement:
-    Code = bitc::FUNC_CODE_INST_INSERTELT;
-    pushValueAndType(I.getOperand(0), InstID, Vals);
-    pushValue(I.getOperand(1), InstID, Vals);
-    pushValueAndType(I.getOperand(2), InstID, Vals);
-    break;
-  case Instruction::ShuffleVector:
-    Code = bitc::FUNC_CODE_INST_SHUFFLEVEC;
-    pushValueAndType(I.getOperand(0), InstID, Vals);
-    pushValue(I.getOperand(1), InstID, Vals);
-    pushValue(cast<ShuffleVectorInst>(I).getShuffleMaskForBitcode(), InstID,
-              Vals);
-    break;
-  case Instruction::ICmp:
-  case Instruction::FCmp: {
-    // compare returning Int1Ty or vector of Int1Ty
-    Code = bitc::FUNC_CODE_INST_CMP2;
-    pushValueAndType(I.getOperand(0), InstID, Vals);
-    pushValue(I.getOperand(1), InstID, Vals);
-    Vals.push_back(cast<CmpInst>(I).getPredicate());
-    uint64_t Flags = getOptimizationFlags(&I);
-    if (Flags != 0)
-      Vals.push_back(Flags);
-    break;
-  }
-
-  case Instruction::Ret:
-    {
-      Code = bitc::FUNC_CODE_INST_RET;
-      unsigned NumOperands = I.getNumOperands();
-      if (NumOperands == 0)
-        AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV;
-      else if (NumOperands == 1) {
-        if (!pushValueAndType(I.getOperand(0), InstID, Vals))
-          AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV;
-      } else {
-        for (unsigned i = 0, e = NumOperands; i != e; ++i)
-          pushValueAndType(I.getOperand(i), InstID, Vals);
-      }
-    }
-    break;
-  case Instruction::Br:
-    {
-      Code = bitc::FUNC_CODE_INST_BR;
-      const BranchInst &II = cast<BranchInst>(I);
-      Vals.push_back(VE.getValueID(II.getSuccessor(0)));
-      if (II.isConditional()) {
-        Vals.push_back(VE.getValueID(II.getSuccessor(1)));
-        pushValue(II.getCondition(), InstID, Vals);
-      }
-    }
-    break;
-  case Instruction::Switch:
-    {
-      Code = bitc::FUNC_CODE_INST_SWITCH;
-      const SwitchInst &SI = cast<SwitchInst>(I);
-      Vals.push_back(VE.getTypeID(SI.getCondition()->getType()));
-      pushValue(SI.getCondition(), InstID, Vals);
-      Vals.push_back(VE.getValueID(SI.getDefaultDest()));
-      for (auto Case : SI.cases()) {
-        Vals.push_back(VE.getValueID(Case.getCaseValue()));
-        Vals.push_back(VE.getValueID(Case.getCaseSuccessor()));
-      }
-    }
-    break;
-  case Instruction::IndirectBr:
-    Code = bitc::FUNC_CODE_INST_INDIRECTBR;
-    Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
-    // Encode the address operand as relative, but not the basic blocks.
-    pushValue(I.getOperand(0), InstID, Vals);
-    for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i)
-      Vals.push_back(VE.getValueID(I.getOperand(i)));
-    break;
-
-  case Instruction::Invoke: {
-    const InvokeInst *II = cast<InvokeInst>(&I);
-    const Value *Callee = II->getCalledOperand();
-    FunctionType *FTy = II->getFunctionType();
-
-    if (II->hasOperandBundles())
-      writeOperandBundles(*II, InstID);
-
-    Code = bitc::FUNC_CODE_INST_INVOKE;
-
-    Vals.push_back(VE.getAttributeListID(II->getAttributes()));
-    Vals.push_back(II->getCallingConv() | 1 << 13);
-    Vals.push_back(VE.getValueID(II->getNormalDest()));
-    Vals.push_back(VE.getValueID(II->getUnwindDest()));
-    Vals.push_back(VE.getTypeID(FTy));
-    pushValueAndType(Callee, InstID, Vals);
-
-    // Emit value #'s for the fixed parameters.
-    for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
-      pushValue(I.getOperand(i), InstID, Vals); // fixed param.
-
-    // Emit type/value pairs for varargs params.
-    if (FTy->isVarArg()) {
-      for (unsigned i = FTy->getNumParams(), e = II->getNumArgOperands();
-           i != e; ++i)
-        pushValueAndType(I.getOperand(i), InstID, Vals); // vararg
-    }
-    break;
-  }
-  case Instruction::Resume:
-    Code = bitc::FUNC_CODE_INST_RESUME;
-    pushValueAndType(I.getOperand(0), InstID, Vals);
-    break;
-  case Instruction::CleanupRet: {
-    Code = bitc::FUNC_CODE_INST_CLEANUPRET;
-    const auto &CRI = cast<CleanupReturnInst>(I);
-    pushValue(CRI.getCleanupPad(), InstID, Vals);
-    if (CRI.hasUnwindDest())
-      Vals.push_back(VE.getValueID(CRI.getUnwindDest()));
-    break;
-  }
-  case Instruction::CatchRet: {
-    Code = bitc::FUNC_CODE_INST_CATCHRET;
-    const auto &CRI = cast<CatchReturnInst>(I);
-    pushValue(CRI.getCatchPad(), InstID, Vals);
-    Vals.push_back(VE.getValueID(CRI.getSuccessor()));
-    break;
-  }
-  case Instruction::CleanupPad:
-  case Instruction::CatchPad: {
-    const auto &FuncletPad = cast<FuncletPadInst>(I);
-    Code = isa<CatchPadInst>(FuncletPad) ? bitc::FUNC_CODE_INST_CATCHPAD
-                                         : bitc::FUNC_CODE_INST_CLEANUPPAD;
-    pushValue(FuncletPad.getParentPad(), InstID, Vals);
-
-    unsigned NumArgOperands = FuncletPad.getNumArgOperands();
-    Vals.push_back(NumArgOperands);
-    for (unsigned Op = 0; Op != NumArgOperands; ++Op)
-      pushValueAndType(FuncletPad.getArgOperand(Op), InstID, Vals);
-    break;
-  }
-  case Instruction::CatchSwitch: {
-    Code = bitc::FUNC_CODE_INST_CATCHSWITCH;
-    const auto &CatchSwitch = cast<CatchSwitchInst>(I);
-
-    pushValue(CatchSwitch.getParentPad(), InstID, Vals);
-
-    unsigned NumHandlers = CatchSwitch.getNumHandlers();
-    Vals.push_back(NumHandlers);
-    for (const BasicBlock *CatchPadBB : CatchSwitch.handlers())
-      Vals.push_back(VE.getValueID(CatchPadBB));
-
-    if (CatchSwitch.hasUnwindDest())
-      Vals.push_back(VE.getValueID(CatchSwitch.getUnwindDest()));
-    break;
-  }
-  case Instruction::CallBr: {
-    const CallBrInst *CBI = cast<CallBrInst>(&I);
-    const Value *Callee = CBI->getCalledOperand();
-    FunctionType *FTy = CBI->getFunctionType();
-
-    if (CBI->hasOperandBundles())
-      writeOperandBundles(*CBI, InstID);
-
-    Code = bitc::FUNC_CODE_INST_CALLBR;
-
-    Vals.push_back(VE.getAttributeListID(CBI->getAttributes()));
-
-    Vals.push_back(CBI->getCallingConv() << bitc::CALL_CCONV |
-                   1 << bitc::CALL_EXPLICIT_TYPE);
-
-    Vals.push_back(VE.getValueID(CBI->getDefaultDest()));
-    Vals.push_back(CBI->getNumIndirectDests());
-    for (unsigned i = 0, e = CBI->getNumIndirectDests(); i != e; ++i)
-      Vals.push_back(VE.getValueID(CBI->getIndirectDest(i)));
-
-    Vals.push_back(VE.getTypeID(FTy));
-    pushValueAndType(Callee, InstID, Vals);
-
-    // Emit value #'s for the fixed parameters.
-    for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i)
-      pushValue(I.getOperand(i), InstID, Vals); // fixed param.
-
-    // Emit type/value pairs for varargs params.
-    if (FTy->isVarArg()) {
-      for (unsigned i = FTy->getNumParams(), e = CBI->getNumArgOperands();
-           i != e; ++i)
-        pushValueAndType(I.getOperand(i), InstID, Vals); // vararg
-    }
-    break;
-  }
-  case Instruction::Unreachable:
-    Code = bitc::FUNC_CODE_INST_UNREACHABLE;
-    AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV;
-    break;
-
-  case Instruction::PHI: {
-    const PHINode &PN = cast<PHINode>(I);
-    Code = bitc::FUNC_CODE_INST_PHI;
-    // With the newer instruction encoding, forward references could give
-    // negative valued IDs.  This is most common for PHIs, so we use
-    // signed VBRs.
-    SmallVector<uint64_t, 128> Vals64;
-    Vals64.push_back(VE.getTypeID(PN.getType()));
-    for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) {
-      pushValueSigned(PN.getIncomingValue(i), InstID, Vals64);
-      Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i)));
-    }
-
-    uint64_t Flags = getOptimizationFlags(&I);
-    if (Flags != 0)
-      Vals64.push_back(Flags);
-
-    // Emit a Vals64 vector and exit.
-    Stream.EmitRecord(Code, Vals64, AbbrevToUse);
-    Vals64.clear();
-    return;
-  }
-
-  case Instruction::LandingPad: {
-    const LandingPadInst &LP = cast<LandingPadInst>(I);
-    Code = bitc::FUNC_CODE_INST_LANDINGPAD;
-    Vals.push_back(VE.getTypeID(LP.getType()));
-    Vals.push_back(LP.isCleanup());
-    Vals.push_back(LP.getNumClauses());
-    for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) {
-      if (LP.isCatch(I))
-        Vals.push_back(LandingPadInst::Catch);
-      else
-        Vals.push_back(LandingPadInst::Filter);
-      pushValueAndType(LP.getClause(I), InstID, Vals);
-    }
-    break;
-  }
-
-  case Instruction::Alloca: {
-    Code = bitc::FUNC_CODE_INST_ALLOCA;
-    const AllocaInst &AI = cast<AllocaInst>(I);
-    Vals.push_back(VE.getTypeID(AI.getAllocatedType()));
-    Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));
-    Vals.push_back(VE.getValueID(I.getOperand(0))); // size.
+    } else if (isa<UndefValue>(C)) { 
+      Code = bitc::CST_CODE_UNDEF; 
+    } else if (const ConstantInt *IV = dyn_cast<ConstantInt>(C)) { 
+      if (IV->getBitWidth() <= 64) { 
+        uint64_t V = IV->getSExtValue(); 
+        emitSignedInt64(Record, V); 
+        Code = bitc::CST_CODE_INTEGER; 
+        AbbrevToUse = CONSTANTS_INTEGER_ABBREV; 
+      } else {                             // Wide integers, > 64 bits in size. 
+        emitWideAPInt(Record, IV->getValue()); 
+        Code = bitc::CST_CODE_WIDE_INTEGER; 
+      } 
+    } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 
+      Code = bitc::CST_CODE_FLOAT; 
+      Type *Ty = CFP->getType(); 
+      if (Ty->isHalfTy() || Ty->isBFloatTy() || Ty->isFloatTy() || 
+          Ty->isDoubleTy()) { 
+        Record.push_back(CFP->getValueAPF().bitcastToAPInt().getZExtValue()); 
+      } else if (Ty->isX86_FP80Ty()) { 
+        // api needed to prevent premature destruction 
+        // bits are not in the same order as a normal i80 APInt, compensate. 
+        APInt api = CFP->getValueAPF().bitcastToAPInt(); 
+        const uint64_t *p = api.getRawData(); 
+        Record.push_back((p[1] << 48) | (p[0] >> 16)); 
+        Record.push_back(p[0] & 0xffffLL); 
+      } else if (Ty->isFP128Ty() || Ty->isPPC_FP128Ty()) { 
+        APInt api = CFP->getValueAPF().bitcastToAPInt(); 
+        const uint64_t *p = api.getRawData(); 
+        Record.push_back(p[0]); 
+        Record.push_back(p[1]); 
+      } else { 
+        assert(0 && "Unknown FP type!"); 
+      } 
+    } else if (isa<ConstantDataSequential>(C) && 
+               cast<ConstantDataSequential>(C)->isString()) { 
+      const ConstantDataSequential *Str = cast<ConstantDataSequential>(C); 
+      // Emit constant strings specially. 
+      unsigned NumElts = Str->getNumElements(); 
+      // If this is a null-terminated string, use the denser CSTRING encoding. 
+      if (Str->isCString()) { 
+        Code = bitc::CST_CODE_CSTRING; 
+        --NumElts;  // Don't encode the null, which isn't allowed by char6. 
+      } else { 
+        Code = bitc::CST_CODE_STRING; 
+        AbbrevToUse = String8Abbrev; 
+      } 
+      bool isCStr7 = Code == bitc::CST_CODE_CSTRING; 
+      bool isCStrChar6 = Code == bitc::CST_CODE_CSTRING; 
+      for (unsigned i = 0; i != NumElts; ++i) { 
+        unsigned char V = Str->getElementAsInteger(i); 
+        Record.push_back(V); 
+        isCStr7 &= (V & 128) == 0; 
+        if (isCStrChar6) 
+          isCStrChar6 = BitCodeAbbrevOp::isChar6(V); 
+      } 
+ 
+      if (isCStrChar6) 
+        AbbrevToUse = CString6Abbrev; 
+      else if (isCStr7) 
+        AbbrevToUse = CString7Abbrev; 
+    } else if (const ConstantDataSequential *CDS = 
+                  dyn_cast<ConstantDataSequential>(C)) { 
+      Code = bitc::CST_CODE_DATA; 
+      Type *EltTy = CDS->getElementType(); 
+      if (isa<IntegerType>(EltTy)) { 
+        for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) 
+          Record.push_back(CDS->getElementAsInteger(i)); 
+      } else { 
+        for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) 
+          Record.push_back( 
+              CDS->getElementAsAPFloat(i).bitcastToAPInt().getLimitedValue()); 
+      } 
+    } else if (isa<ConstantAggregate>(C)) { 
+      Code = bitc::CST_CODE_AGGREGATE; 
+      for (const Value *Op : C->operands()) 
+        Record.push_back(VE.getValueID(Op)); 
+      AbbrevToUse = AggregateAbbrev; 
+    } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 
+      switch (CE->getOpcode()) { 
+      default: 
+        if (Instruction::isCast(CE->getOpcode())) { 
+          Code = bitc::CST_CODE_CE_CAST; 
+          Record.push_back(getEncodedCastOpcode(CE->getOpcode())); 
+          Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 
+          Record.push_back(VE.getValueID(C->getOperand(0))); 
+          AbbrevToUse = CONSTANTS_CE_CAST_Abbrev; 
+        } else { 
+          assert(CE->getNumOperands() == 2 && "Unknown constant expr!"); 
+          Code = bitc::CST_CODE_CE_BINOP; 
+          Record.push_back(getEncodedBinaryOpcode(CE->getOpcode())); 
+          Record.push_back(VE.getValueID(C->getOperand(0))); 
+          Record.push_back(VE.getValueID(C->getOperand(1))); 
+          uint64_t Flags = getOptimizationFlags(CE); 
+          if (Flags != 0) 
+            Record.push_back(Flags); 
+        } 
+        break; 
+      case Instruction::FNeg: { 
+        assert(CE->getNumOperands() == 1 && "Unknown constant expr!"); 
+        Code = bitc::CST_CODE_CE_UNOP; 
+        Record.push_back(getEncodedUnaryOpcode(CE->getOpcode())); 
+        Record.push_back(VE.getValueID(C->getOperand(0))); 
+        uint64_t Flags = getOptimizationFlags(CE); 
+        if (Flags != 0) 
+          Record.push_back(Flags); 
+        break; 
+      } 
+      case Instruction::GetElementPtr: { 
+        Code = bitc::CST_CODE_CE_GEP; 
+        const auto *GO = cast<GEPOperator>(C); 
+        Record.push_back(VE.getTypeID(GO->getSourceElementType())); 
+        if (Optional<unsigned> Idx = GO->getInRangeIndex()) { 
+          Code = bitc::CST_CODE_CE_GEP_WITH_INRANGE_INDEX; 
+          Record.push_back((*Idx << 1) | GO->isInBounds()); 
+        } else if (GO->isInBounds()) 
+          Code = bitc::CST_CODE_CE_INBOUNDS_GEP; 
+        for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) { 
+          Record.push_back(VE.getTypeID(C->getOperand(i)->getType())); 
+          Record.push_back(VE.getValueID(C->getOperand(i))); 
+        } 
+        break; 
+      } 
+      case Instruction::Select: 
+        Code = bitc::CST_CODE_CE_SELECT; 
+        Record.push_back(VE.getValueID(C->getOperand(0))); 
+        Record.push_back(VE.getValueID(C->getOperand(1))); 
+        Record.push_back(VE.getValueID(C->getOperand(2))); 
+        break; 
+      case Instruction::ExtractElement: 
+        Code = bitc::CST_CODE_CE_EXTRACTELT; 
+        Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 
+        Record.push_back(VE.getValueID(C->getOperand(0))); 
+        Record.push_back(VE.getTypeID(C->getOperand(1)->getType())); 
+        Record.push_back(VE.getValueID(C->getOperand(1))); 
+        break; 
+      case Instruction::InsertElement: 
+        Code = bitc::CST_CODE_CE_INSERTELT; 
+        Record.push_back(VE.getValueID(C->getOperand(0))); 
+        Record.push_back(VE.getValueID(C->getOperand(1))); 
+        Record.push_back(VE.getTypeID(C->getOperand(2)->getType())); 
+        Record.push_back(VE.getValueID(C->getOperand(2))); 
+        break; 
+      case Instruction::ShuffleVector: 
+        // If the return type and argument types are the same, this is a 
+        // standard shufflevector instruction.  If the types are different, 
+        // then the shuffle is widening or truncating the input vectors, and 
+        // the argument type must also be encoded. 
+        if (C->getType() == C->getOperand(0)->getType()) { 
+          Code = bitc::CST_CODE_CE_SHUFFLEVEC; 
+        } else { 
+          Code = bitc::CST_CODE_CE_SHUFVEC_EX; 
+          Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 
+        } 
+        Record.push_back(VE.getValueID(C->getOperand(0))); 
+        Record.push_back(VE.getValueID(C->getOperand(1))); 
+        Record.push_back(VE.getValueID(CE->getShuffleMaskForBitcode())); 
+        break; 
+      case Instruction::ICmp: 
+      case Instruction::FCmp: 
+        Code = bitc::CST_CODE_CE_CMP; 
+        Record.push_back(VE.getTypeID(C->getOperand(0)->getType())); 
+        Record.push_back(VE.getValueID(C->getOperand(0))); 
+        Record.push_back(VE.getValueID(C->getOperand(1))); 
+        Record.push_back(CE->getPredicate()); 
+        break; 
+      } 
+    } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) { 
+      Code = bitc::CST_CODE_BLOCKADDRESS; 
+      Record.push_back(VE.getTypeID(BA->getFunction()->getType())); 
+      Record.push_back(VE.getValueID(BA->getFunction())); 
+      Record.push_back(VE.getGlobalBasicBlockID(BA->getBasicBlock())); 
+    } else { 
+#ifndef NDEBUG 
+      C->dump(); 
+#endif 
+      llvm_unreachable("Unknown constant!"); 
+    } 
+    Stream.EmitRecord(Code, Record, AbbrevToUse); 
+    Record.clear(); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::writeModuleConstants() { 
+  const ValueEnumerator::ValueList &Vals = VE.getValues(); 
+ 
+  // Find the first constant to emit, which is the first non-globalvalue value. 
+  // We know globalvalues have been emitted by WriteModuleInfo. 
+  for (unsigned i = 0, e = Vals.size(); i != e; ++i) { 
+    if (!isa<GlobalValue>(Vals[i].first)) { 
+      writeConstants(i, Vals.size(), true); 
+      return; 
+    } 
+  } 
+} 
+ 
+/// pushValueAndType - The file has to encode both the value and type id for 
+/// many values, because we need to know what type to create for forward 
+/// references.  However, most operands are not forward references, so this type 
+/// field is not needed. 
+/// 
+/// This function adds V's value ID to Vals.  If the value ID is higher than the 
+/// instruction ID, then it is a forward reference, and it also includes the 
+/// type ID.  The value ID that is written is encoded relative to the InstID. 
+bool ModuleBitcodeWriter::pushValueAndType(const Value *V, unsigned InstID, 
+                                           SmallVectorImpl<unsigned> &Vals) { 
+  unsigned ValID = VE.getValueID(V); 
+  // Make encoding relative to the InstID. 
+  Vals.push_back(InstID - ValID); 
+  if (ValID >= InstID) { 
+    Vals.push_back(VE.getTypeID(V->getType())); 
+    return true; 
+  } 
+  return false; 
+} 
+ 
+void ModuleBitcodeWriter::writeOperandBundles(const CallBase &CS, 
+                                              unsigned InstID) { 
+  SmallVector<unsigned, 64> Record; 
+  LLVMContext &C = CS.getContext(); 
+ 
+  for (unsigned i = 0, e = CS.getNumOperandBundles(); i != e; ++i) { 
+    const auto &Bundle = CS.getOperandBundleAt(i); 
+    Record.push_back(C.getOperandBundleTagID(Bundle.getTagName())); 
+ 
+    for (auto &Input : Bundle.Inputs) 
+      pushValueAndType(Input, InstID, Record); 
+ 
+    Stream.EmitRecord(bitc::FUNC_CODE_OPERAND_BUNDLE, Record); 
+    Record.clear(); 
+  } 
+} 
+ 
+/// pushValue - Like pushValueAndType, but where the type of the value is 
+/// omitted (perhaps it was already encoded in an earlier operand). 
+void ModuleBitcodeWriter::pushValue(const Value *V, unsigned InstID, 
+                                    SmallVectorImpl<unsigned> &Vals) { 
+  unsigned ValID = VE.getValueID(V); 
+  Vals.push_back(InstID - ValID); 
+} 
+ 
+void ModuleBitcodeWriter::pushValueSigned(const Value *V, unsigned InstID, 
+                                          SmallVectorImpl<uint64_t> &Vals) { 
+  unsigned ValID = VE.getValueID(V); 
+  int64_t diff = ((int32_t)InstID - (int32_t)ValID); 
+  emitSignedInt64(Vals, diff); 
+} 
+ 
+/// WriteInstruction - Emit an instruction to the specified stream. 
+void ModuleBitcodeWriter::writeInstruction(const Instruction &I, 
+                                           unsigned InstID, 
+                                           SmallVectorImpl<unsigned> &Vals) { 
+  unsigned Code = 0; 
+  unsigned AbbrevToUse = 0; 
+  VE.setInstructionID(&I); 
+  switch (I.getOpcode()) { 
+  default: 
+    if (Instruction::isCast(I.getOpcode())) { 
+      Code = bitc::FUNC_CODE_INST_CAST; 
+      if (!pushValueAndType(I.getOperand(0), InstID, Vals)) 
+        AbbrevToUse = FUNCTION_INST_CAST_ABBREV; 
+      Vals.push_back(VE.getTypeID(I.getType())); 
+      Vals.push_back(getEncodedCastOpcode(I.getOpcode())); 
+    } else { 
+      assert(isa<BinaryOperator>(I) && "Unknown instruction!"); 
+      Code = bitc::FUNC_CODE_INST_BINOP; 
+      if (!pushValueAndType(I.getOperand(0), InstID, Vals)) 
+        AbbrevToUse = FUNCTION_INST_BINOP_ABBREV; 
+      pushValue(I.getOperand(1), InstID, Vals); 
+      Vals.push_back(getEncodedBinaryOpcode(I.getOpcode())); 
+      uint64_t Flags = getOptimizationFlags(&I); 
+      if (Flags != 0) { 
+        if (AbbrevToUse == FUNCTION_INST_BINOP_ABBREV) 
+          AbbrevToUse = FUNCTION_INST_BINOP_FLAGS_ABBREV; 
+        Vals.push_back(Flags); 
+      } 
+    } 
+    break; 
+  case Instruction::FNeg: { 
+    Code = bitc::FUNC_CODE_INST_UNOP; 
+    if (!pushValueAndType(I.getOperand(0), InstID, Vals)) 
+      AbbrevToUse = FUNCTION_INST_UNOP_ABBREV; 
+    Vals.push_back(getEncodedUnaryOpcode(I.getOpcode())); 
+    uint64_t Flags = getOptimizationFlags(&I); 
+    if (Flags != 0) { 
+      if (AbbrevToUse == FUNCTION_INST_UNOP_ABBREV) 
+        AbbrevToUse = FUNCTION_INST_UNOP_FLAGS_ABBREV; 
+      Vals.push_back(Flags); 
+    } 
+    break; 
+  } 
+  case Instruction::GetElementPtr: { 
+    Code = bitc::FUNC_CODE_INST_GEP; 
+    AbbrevToUse = FUNCTION_INST_GEP_ABBREV; 
+    auto &GEPInst = cast<GetElementPtrInst>(I); 
+    Vals.push_back(GEPInst.isInBounds()); 
+    Vals.push_back(VE.getTypeID(GEPInst.getSourceElementType())); 
+    for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) 
+      pushValueAndType(I.getOperand(i), InstID, Vals); 
+    break; 
+  } 
+  case Instruction::ExtractValue: { 
+    Code = bitc::FUNC_CODE_INST_EXTRACTVAL; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); 
+    const ExtractValueInst *EVI = cast<ExtractValueInst>(&I); 
+    Vals.append(EVI->idx_begin(), EVI->idx_end()); 
+    break; 
+  } 
+  case Instruction::InsertValue: { 
+    Code = bitc::FUNC_CODE_INST_INSERTVAL; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); 
+    pushValueAndType(I.getOperand(1), InstID, Vals); 
+    const InsertValueInst *IVI = cast<InsertValueInst>(&I); 
+    Vals.append(IVI->idx_begin(), IVI->idx_end()); 
+    break; 
+  } 
+  case Instruction::Select: { 
+    Code = bitc::FUNC_CODE_INST_VSELECT; 
+    pushValueAndType(I.getOperand(1), InstID, Vals); 
+    pushValue(I.getOperand(2), InstID, Vals); 
+    pushValueAndType(I.getOperand(0), InstID, Vals); 
+    uint64_t Flags = getOptimizationFlags(&I); 
+    if (Flags != 0) 
+      Vals.push_back(Flags); 
+    break; 
+  } 
+  case Instruction::ExtractElement: 
+    Code = bitc::FUNC_CODE_INST_EXTRACTELT; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); 
+    pushValueAndType(I.getOperand(1), InstID, Vals); 
+    break; 
+  case Instruction::InsertElement: 
+    Code = bitc::FUNC_CODE_INST_INSERTELT; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); 
+    pushValue(I.getOperand(1), InstID, Vals); 
+    pushValueAndType(I.getOperand(2), InstID, Vals); 
+    break; 
+  case Instruction::ShuffleVector: 
+    Code = bitc::FUNC_CODE_INST_SHUFFLEVEC; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); 
+    pushValue(I.getOperand(1), InstID, Vals); 
+    pushValue(cast<ShuffleVectorInst>(I).getShuffleMaskForBitcode(), InstID, 
+              Vals); 
+    break; 
+  case Instruction::ICmp: 
+  case Instruction::FCmp: { 
+    // compare returning Int1Ty or vector of Int1Ty 
+    Code = bitc::FUNC_CODE_INST_CMP2; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); 
+    pushValue(I.getOperand(1), InstID, Vals); 
+    Vals.push_back(cast<CmpInst>(I).getPredicate()); 
+    uint64_t Flags = getOptimizationFlags(&I); 
+    if (Flags != 0) 
+      Vals.push_back(Flags); 
+    break; 
+  } 
+ 
+  case Instruction::Ret: 
+    { 
+      Code = bitc::FUNC_CODE_INST_RET; 
+      unsigned NumOperands = I.getNumOperands(); 
+      if (NumOperands == 0) 
+        AbbrevToUse = FUNCTION_INST_RET_VOID_ABBREV; 
+      else if (NumOperands == 1) { 
+        if (!pushValueAndType(I.getOperand(0), InstID, Vals)) 
+          AbbrevToUse = FUNCTION_INST_RET_VAL_ABBREV; 
+      } else { 
+        for (unsigned i = 0, e = NumOperands; i != e; ++i) 
+          pushValueAndType(I.getOperand(i), InstID, Vals); 
+      } 
+    } 
+    break; 
+  case Instruction::Br: 
+    { 
+      Code = bitc::FUNC_CODE_INST_BR; 
+      const BranchInst &II = cast<BranchInst>(I); 
+      Vals.push_back(VE.getValueID(II.getSuccessor(0))); 
+      if (II.isConditional()) { 
+        Vals.push_back(VE.getValueID(II.getSuccessor(1))); 
+        pushValue(II.getCondition(), InstID, Vals); 
+      } 
+    } 
+    break; 
+  case Instruction::Switch: 
+    { 
+      Code = bitc::FUNC_CODE_INST_SWITCH; 
+      const SwitchInst &SI = cast<SwitchInst>(I); 
+      Vals.push_back(VE.getTypeID(SI.getCondition()->getType())); 
+      pushValue(SI.getCondition(), InstID, Vals); 
+      Vals.push_back(VE.getValueID(SI.getDefaultDest())); 
+      for (auto Case : SI.cases()) { 
+        Vals.push_back(VE.getValueID(Case.getCaseValue())); 
+        Vals.push_back(VE.getValueID(Case.getCaseSuccessor())); 
+      } 
+    } 
+    break; 
+  case Instruction::IndirectBr: 
+    Code = bitc::FUNC_CODE_INST_INDIRECTBR; 
+    Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 
+    // Encode the address operand as relative, but not the basic blocks. 
+    pushValue(I.getOperand(0), InstID, Vals); 
+    for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) 
+      Vals.push_back(VE.getValueID(I.getOperand(i))); 
+    break; 
+ 
+  case Instruction::Invoke: { 
+    const InvokeInst *II = cast<InvokeInst>(&I); 
+    const Value *Callee = II->getCalledOperand(); 
+    FunctionType *FTy = II->getFunctionType(); 
+ 
+    if (II->hasOperandBundles()) 
+      writeOperandBundles(*II, InstID); 
+ 
+    Code = bitc::FUNC_CODE_INST_INVOKE; 
+ 
+    Vals.push_back(VE.getAttributeListID(II->getAttributes())); 
+    Vals.push_back(II->getCallingConv() | 1 << 13); 
+    Vals.push_back(VE.getValueID(II->getNormalDest())); 
+    Vals.push_back(VE.getValueID(II->getUnwindDest())); 
+    Vals.push_back(VE.getTypeID(FTy)); 
+    pushValueAndType(Callee, InstID, Vals); 
+ 
+    // Emit value #'s for the fixed parameters. 
+    for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 
+      pushValue(I.getOperand(i), InstID, Vals); // fixed param. 
+ 
+    // Emit type/value pairs for varargs params. 
+    if (FTy->isVarArg()) { 
+      for (unsigned i = FTy->getNumParams(), e = II->getNumArgOperands(); 
+           i != e; ++i) 
+        pushValueAndType(I.getOperand(i), InstID, Vals); // vararg 
+    } 
+    break; 
+  } 
+  case Instruction::Resume: 
+    Code = bitc::FUNC_CODE_INST_RESUME; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); 
+    break; 
+  case Instruction::CleanupRet: { 
+    Code = bitc::FUNC_CODE_INST_CLEANUPRET; 
+    const auto &CRI = cast<CleanupReturnInst>(I); 
+    pushValue(CRI.getCleanupPad(), InstID, Vals); 
+    if (CRI.hasUnwindDest()) 
+      Vals.push_back(VE.getValueID(CRI.getUnwindDest())); 
+    break; 
+  } 
+  case Instruction::CatchRet: { 
+    Code = bitc::FUNC_CODE_INST_CATCHRET; 
+    const auto &CRI = cast<CatchReturnInst>(I); 
+    pushValue(CRI.getCatchPad(), InstID, Vals); 
+    Vals.push_back(VE.getValueID(CRI.getSuccessor())); 
+    break; 
+  } 
+  case Instruction::CleanupPad: 
+  case Instruction::CatchPad: { 
+    const auto &FuncletPad = cast<FuncletPadInst>(I); 
+    Code = isa<CatchPadInst>(FuncletPad) ? bitc::FUNC_CODE_INST_CATCHPAD 
+                                         : bitc::FUNC_CODE_INST_CLEANUPPAD; 
+    pushValue(FuncletPad.getParentPad(), InstID, Vals); 
+ 
+    unsigned NumArgOperands = FuncletPad.getNumArgOperands(); 
+    Vals.push_back(NumArgOperands); 
+    for (unsigned Op = 0; Op != NumArgOperands; ++Op) 
+      pushValueAndType(FuncletPad.getArgOperand(Op), InstID, Vals); 
+    break; 
+  } 
+  case Instruction::CatchSwitch: { 
+    Code = bitc::FUNC_CODE_INST_CATCHSWITCH; 
+    const auto &CatchSwitch = cast<CatchSwitchInst>(I); 
+ 
+    pushValue(CatchSwitch.getParentPad(), InstID, Vals); 
+ 
+    unsigned NumHandlers = CatchSwitch.getNumHandlers(); 
+    Vals.push_back(NumHandlers); 
+    for (const BasicBlock *CatchPadBB : CatchSwitch.handlers()) 
+      Vals.push_back(VE.getValueID(CatchPadBB)); 
+ 
+    if (CatchSwitch.hasUnwindDest()) 
+      Vals.push_back(VE.getValueID(CatchSwitch.getUnwindDest())); 
+    break; 
+  } 
+  case Instruction::CallBr: { 
+    const CallBrInst *CBI = cast<CallBrInst>(&I); 
+    const Value *Callee = CBI->getCalledOperand(); 
+    FunctionType *FTy = CBI->getFunctionType(); 
+ 
+    if (CBI->hasOperandBundles()) 
+      writeOperandBundles(*CBI, InstID); 
+ 
+    Code = bitc::FUNC_CODE_INST_CALLBR; 
+ 
+    Vals.push_back(VE.getAttributeListID(CBI->getAttributes())); 
+ 
+    Vals.push_back(CBI->getCallingConv() << bitc::CALL_CCONV | 
+                   1 << bitc::CALL_EXPLICIT_TYPE); 
+ 
+    Vals.push_back(VE.getValueID(CBI->getDefaultDest())); 
+    Vals.push_back(CBI->getNumIndirectDests()); 
+    for (unsigned i = 0, e = CBI->getNumIndirectDests(); i != e; ++i) 
+      Vals.push_back(VE.getValueID(CBI->getIndirectDest(i))); 
+ 
+    Vals.push_back(VE.getTypeID(FTy)); 
+    pushValueAndType(Callee, InstID, Vals); 
+ 
+    // Emit value #'s for the fixed parameters. 
+    for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) 
+      pushValue(I.getOperand(i), InstID, Vals); // fixed param. 
+ 
+    // Emit type/value pairs for varargs params. 
+    if (FTy->isVarArg()) { 
+      for (unsigned i = FTy->getNumParams(), e = CBI->getNumArgOperands(); 
+           i != e; ++i) 
+        pushValueAndType(I.getOperand(i), InstID, Vals); // vararg 
+    } 
+    break; 
+  } 
+  case Instruction::Unreachable: 
+    Code = bitc::FUNC_CODE_INST_UNREACHABLE; 
+    AbbrevToUse = FUNCTION_INST_UNREACHABLE_ABBREV; 
+    break; 
+ 
+  case Instruction::PHI: { 
+    const PHINode &PN = cast<PHINode>(I); 
+    Code = bitc::FUNC_CODE_INST_PHI; 
+    // With the newer instruction encoding, forward references could give 
+    // negative valued IDs.  This is most common for PHIs, so we use 
+    // signed VBRs. 
+    SmallVector<uint64_t, 128> Vals64; 
+    Vals64.push_back(VE.getTypeID(PN.getType())); 
+    for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) { 
+      pushValueSigned(PN.getIncomingValue(i), InstID, Vals64); 
+      Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i))); 
+    } 
+ 
+    uint64_t Flags = getOptimizationFlags(&I); 
+    if (Flags != 0) 
+      Vals64.push_back(Flags); 
+ 
+    // Emit a Vals64 vector and exit. 
+    Stream.EmitRecord(Code, Vals64, AbbrevToUse); 
+    Vals64.clear(); 
+    return; 
+  } 
+ 
+  case Instruction::LandingPad: { 
+    const LandingPadInst &LP = cast<LandingPadInst>(I); 
+    Code = bitc::FUNC_CODE_INST_LANDINGPAD; 
+    Vals.push_back(VE.getTypeID(LP.getType())); 
+    Vals.push_back(LP.isCleanup()); 
+    Vals.push_back(LP.getNumClauses()); 
+    for (unsigned I = 0, E = LP.getNumClauses(); I != E; ++I) { 
+      if (LP.isCatch(I)) 
+        Vals.push_back(LandingPadInst::Catch); 
+      else 
+        Vals.push_back(LandingPadInst::Filter); 
+      pushValueAndType(LP.getClause(I), InstID, Vals); 
+    } 
+    break; 
+  } 
+ 
+  case Instruction::Alloca: { 
+    Code = bitc::FUNC_CODE_INST_ALLOCA; 
+    const AllocaInst &AI = cast<AllocaInst>(I); 
+    Vals.push_back(VE.getTypeID(AI.getAllocatedType())); 
+    Vals.push_back(VE.getTypeID(I.getOperand(0)->getType())); 
+    Vals.push_back(VE.getValueID(I.getOperand(0))); // size. 
     using APV = AllocaPackedValues;
     unsigned Record = 0;
     Bitfield::set<APV::Align>(Record, getEncodedAlign(AI.getAlign()));
@@ -3009,655 +3009,655 @@ void ModuleBitcodeWriter::writeInstruction(const Instruction &I,
     Bitfield::set<APV::ExplicitType>(Record, true);
     Bitfield::set<APV::SwiftError>(Record, AI.isSwiftError());
     Vals.push_back(Record);
-    break;
-  }
-
-  case Instruction::Load:
-    if (cast<LoadInst>(I).isAtomic()) {
-      Code = bitc::FUNC_CODE_INST_LOADATOMIC;
-      pushValueAndType(I.getOperand(0), InstID, Vals);
-    } else {
-      Code = bitc::FUNC_CODE_INST_LOAD;
-      if (!pushValueAndType(I.getOperand(0), InstID, Vals)) // ptr
-        AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
-    }
-    Vals.push_back(VE.getTypeID(I.getType()));
+    break; 
+  } 
+ 
+  case Instruction::Load: 
+    if (cast<LoadInst>(I).isAtomic()) { 
+      Code = bitc::FUNC_CODE_INST_LOADATOMIC; 
+      pushValueAndType(I.getOperand(0), InstID, Vals); 
+    } else { 
+      Code = bitc::FUNC_CODE_INST_LOAD; 
+      if (!pushValueAndType(I.getOperand(0), InstID, Vals)) // ptr 
+        AbbrevToUse = FUNCTION_INST_LOAD_ABBREV; 
+    } 
+    Vals.push_back(VE.getTypeID(I.getType())); 
     Vals.push_back(getEncodedAlign(cast<LoadInst>(I).getAlign()));
-    Vals.push_back(cast<LoadInst>(I).isVolatile());
-    if (cast<LoadInst>(I).isAtomic()) {
-      Vals.push_back(getEncodedOrdering(cast<LoadInst>(I).getOrdering()));
-      Vals.push_back(getEncodedSyncScopeID(cast<LoadInst>(I).getSyncScopeID()));
-    }
-    break;
-  case Instruction::Store:
-    if (cast<StoreInst>(I).isAtomic())
-      Code = bitc::FUNC_CODE_INST_STOREATOMIC;
-    else
-      Code = bitc::FUNC_CODE_INST_STORE;
-    pushValueAndType(I.getOperand(1), InstID, Vals); // ptrty + ptr
-    pushValueAndType(I.getOperand(0), InstID, Vals); // valty + val
+    Vals.push_back(cast<LoadInst>(I).isVolatile()); 
+    if (cast<LoadInst>(I).isAtomic()) { 
+      Vals.push_back(getEncodedOrdering(cast<LoadInst>(I).getOrdering())); 
+      Vals.push_back(getEncodedSyncScopeID(cast<LoadInst>(I).getSyncScopeID())); 
+    } 
+    break; 
+  case Instruction::Store: 
+    if (cast<StoreInst>(I).isAtomic()) 
+      Code = bitc::FUNC_CODE_INST_STOREATOMIC; 
+    else 
+      Code = bitc::FUNC_CODE_INST_STORE; 
+    pushValueAndType(I.getOperand(1), InstID, Vals); // ptrty + ptr 
+    pushValueAndType(I.getOperand(0), InstID, Vals); // valty + val 
     Vals.push_back(getEncodedAlign(cast<StoreInst>(I).getAlign()));
-    Vals.push_back(cast<StoreInst>(I).isVolatile());
-    if (cast<StoreInst>(I).isAtomic()) {
-      Vals.push_back(getEncodedOrdering(cast<StoreInst>(I).getOrdering()));
-      Vals.push_back(
-          getEncodedSyncScopeID(cast<StoreInst>(I).getSyncScopeID()));
-    }
-    break;
-  case Instruction::AtomicCmpXchg:
-    Code = bitc::FUNC_CODE_INST_CMPXCHG;
-    pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr
-    pushValueAndType(I.getOperand(1), InstID, Vals); // cmp.
-    pushValue(I.getOperand(2), InstID, Vals);        // newval.
-    Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile());
-    Vals.push_back(
-        getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getSuccessOrdering()));
-    Vals.push_back(
-        getEncodedSyncScopeID(cast<AtomicCmpXchgInst>(I).getSyncScopeID()));
-    Vals.push_back(
-        getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getFailureOrdering()));
-    Vals.push_back(cast<AtomicCmpXchgInst>(I).isWeak());
-    break;
-  case Instruction::AtomicRMW:
-    Code = bitc::FUNC_CODE_INST_ATOMICRMW;
-    pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr
-    pushValue(I.getOperand(1), InstID, Vals);        // val.
-    Vals.push_back(
-        getEncodedRMWOperation(cast<AtomicRMWInst>(I).getOperation()));
-    Vals.push_back(cast<AtomicRMWInst>(I).isVolatile());
-    Vals.push_back(getEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering()));
-    Vals.push_back(
-        getEncodedSyncScopeID(cast<AtomicRMWInst>(I).getSyncScopeID()));
-    break;
-  case Instruction::Fence:
-    Code = bitc::FUNC_CODE_INST_FENCE;
-    Vals.push_back(getEncodedOrdering(cast<FenceInst>(I).getOrdering()));
-    Vals.push_back(getEncodedSyncScopeID(cast<FenceInst>(I).getSyncScopeID()));
-    break;
-  case Instruction::Call: {
-    const CallInst &CI = cast<CallInst>(I);
-    FunctionType *FTy = CI.getFunctionType();
-
-    if (CI.hasOperandBundles())
-      writeOperandBundles(CI, InstID);
-
-    Code = bitc::FUNC_CODE_INST_CALL;
-
-    Vals.push_back(VE.getAttributeListID(CI.getAttributes()));
-
-    unsigned Flags = getOptimizationFlags(&I);
-    Vals.push_back(CI.getCallingConv() << bitc::CALL_CCONV |
-                   unsigned(CI.isTailCall()) << bitc::CALL_TAIL |
-                   unsigned(CI.isMustTailCall()) << bitc::CALL_MUSTTAIL |
-                   1 << bitc::CALL_EXPLICIT_TYPE |
-                   unsigned(CI.isNoTailCall()) << bitc::CALL_NOTAIL |
-                   unsigned(Flags != 0) << bitc::CALL_FMF);
-    if (Flags != 0)
-      Vals.push_back(Flags);
-
-    Vals.push_back(VE.getTypeID(FTy));
-    pushValueAndType(CI.getCalledOperand(), InstID, Vals); // Callee
-
-    // Emit value #'s for the fixed parameters.
-    for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) {
-      // Check for labels (can happen with asm labels).
-      if (FTy->getParamType(i)->isLabelTy())
-        Vals.push_back(VE.getValueID(CI.getArgOperand(i)));
-      else
-        pushValue(CI.getArgOperand(i), InstID, Vals); // fixed param.
-    }
-
-    // Emit type/value pairs for varargs params.
-    if (FTy->isVarArg()) {
-      for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands();
-           i != e; ++i)
-        pushValueAndType(CI.getArgOperand(i), InstID, Vals); // varargs
-    }
-    break;
-  }
-  case Instruction::VAArg:
-    Code = bitc::FUNC_CODE_INST_VAARG;
-    Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));   // valistty
-    pushValue(I.getOperand(0), InstID, Vals);                   // valist.
-    Vals.push_back(VE.getTypeID(I.getType())); // restype.
-    break;
-  case Instruction::Freeze:
-    Code = bitc::FUNC_CODE_INST_FREEZE;
-    pushValueAndType(I.getOperand(0), InstID, Vals);
-    break;
-  }
-
-  Stream.EmitRecord(Code, Vals, AbbrevToUse);
-  Vals.clear();
-}
-
-/// Write a GlobalValue VST to the module. The purpose of this data structure is
-/// to allow clients to efficiently find the function body.
-void ModuleBitcodeWriter::writeGlobalValueSymbolTable(
-  DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) {
-  // Get the offset of the VST we are writing, and backpatch it into
-  // the VST forward declaration record.
-  uint64_t VSTOffset = Stream.GetCurrentBitNo();
-  // The BitcodeStartBit was the stream offset of the identification block.
-  VSTOffset -= bitcodeStartBit();
-  assert((VSTOffset & 31) == 0 && "VST block not 32-bit aligned");
-  // Note that we add 1 here because the offset is relative to one word
-  // before the start of the identification block, which was historically
-  // always the start of the regular bitcode header.
-  Stream.BackpatchWord(VSTOffsetPlaceholder, VSTOffset / 32 + 1);
-
-  Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
-
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_FNENTRY));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // funcoffset
-  unsigned FnEntryAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  for (const Function &F : M) {
-    uint64_t Record[2];
-
-    if (F.isDeclaration())
-      continue;
-
-    Record[0] = VE.getValueID(&F);
-
-    // Save the word offset of the function (from the start of the
-    // actual bitcode written to the stream).
-    uint64_t BitcodeIndex = FunctionToBitcodeIndex[&F] - bitcodeStartBit();
-    assert((BitcodeIndex & 31) == 0 && "function block not 32-bit aligned");
-    // Note that we add 1 here because the offset is relative to one word
-    // before the start of the identification block, which was historically
-    // always the start of the regular bitcode header.
-    Record[1] = BitcodeIndex / 32 + 1;
-
-    Stream.EmitRecord(bitc::VST_CODE_FNENTRY, Record, FnEntryAbbrev);
-  }
-
-  Stream.ExitBlock();
-}
-
-/// Emit names for arguments, instructions and basic blocks in a function.
-void ModuleBitcodeWriter::writeFunctionLevelValueSymbolTable(
-    const ValueSymbolTable &VST) {
-  if (VST.empty())
-    return;
-
-  Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
-
-  // FIXME: Set up the abbrev, we know how many values there are!
-  // FIXME: We know if the type names can use 7-bit ascii.
-  SmallVector<uint64_t, 64> NameVals;
-
-  for (const ValueName &Name : VST) {
-    // Figure out the encoding to use for the name.
-    StringEncoding Bits = getStringEncoding(Name.getKey());
-
-    unsigned AbbrevToUse = VST_ENTRY_8_ABBREV;
-    NameVals.push_back(VE.getValueID(Name.getValue()));
-
-    // VST_CODE_ENTRY:   [valueid, namechar x N]
-    // VST_CODE_BBENTRY: [bbid, namechar x N]
-    unsigned Code;
-    if (isa<BasicBlock>(Name.getValue())) {
-      Code = bitc::VST_CODE_BBENTRY;
-      if (Bits == SE_Char6)
-        AbbrevToUse = VST_BBENTRY_6_ABBREV;
-    } else {
-      Code = bitc::VST_CODE_ENTRY;
-      if (Bits == SE_Char6)
-        AbbrevToUse = VST_ENTRY_6_ABBREV;
-      else if (Bits == SE_Fixed7)
-        AbbrevToUse = VST_ENTRY_7_ABBREV;
-    }
-
-    for (const auto P : Name.getKey())
-      NameVals.push_back((unsigned char)P);
-
-    // Emit the finished record.
-    Stream.EmitRecord(Code, NameVals, AbbrevToUse);
-    NameVals.clear();
-  }
-
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::writeUseList(UseListOrder &&Order) {
-  assert(Order.Shuffle.size() >= 2 && "Shuffle too small");
-  unsigned Code;
-  if (isa<BasicBlock>(Order.V))
-    Code = bitc::USELIST_CODE_BB;
-  else
-    Code = bitc::USELIST_CODE_DEFAULT;
-
-  SmallVector<uint64_t, 64> Record(Order.Shuffle.begin(), Order.Shuffle.end());
-  Record.push_back(VE.getValueID(Order.V));
-  Stream.EmitRecord(Code, Record);
-}
-
-void ModuleBitcodeWriter::writeUseListBlock(const Function *F) {
-  assert(VE.shouldPreserveUseListOrder() &&
-         "Expected to be preserving use-list order");
-
-  auto hasMore = [&]() {
-    return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F;
-  };
-  if (!hasMore())
-    // Nothing to do.
-    return;
-
-  Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
-  while (hasMore()) {
-    writeUseList(std::move(VE.UseListOrders.back()));
-    VE.UseListOrders.pop_back();
-  }
-  Stream.ExitBlock();
-}
-
-/// Emit a function body to the module stream.
-void ModuleBitcodeWriter::writeFunction(
-    const Function &F,
-    DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) {
-  // Save the bitcode index of the start of this function block for recording
-  // in the VST.
-  FunctionToBitcodeIndex[&F] = Stream.GetCurrentBitNo();
-
-  Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
-  VE.incorporateFunction(F);
-
-  SmallVector<unsigned, 64> Vals;
-
-  // Emit the number of basic blocks, so the reader can create them ahead of
-  // time.
-  Vals.push_back(VE.getBasicBlocks().size());
-  Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
-  Vals.clear();
-
-  // If there are function-local constants, emit them now.
-  unsigned CstStart, CstEnd;
-  VE.getFunctionConstantRange(CstStart, CstEnd);
-  writeConstants(CstStart, CstEnd, false);
-
-  // If there is function-local metadata, emit it now.
-  writeFunctionMetadata(F);
-
-  // Keep a running idea of what the instruction ID is.
-  unsigned InstID = CstEnd;
-
-  bool NeedsMetadataAttachment = F.hasMetadata();
-
-  DILocation *LastDL = nullptr;
-  // Finally, emit all the instructions, in order.
-  for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
-    for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
-         I != E; ++I) {
-      writeInstruction(*I, InstID, Vals);
-
-      if (!I->getType()->isVoidTy())
-        ++InstID;
-
-      // If the instruction has metadata, write a metadata attachment later.
-      NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
-
-      // If the instruction has a debug location, emit it.
-      DILocation *DL = I->getDebugLoc();
-      if (!DL)
-        continue;
-
-      if (DL == LastDL) {
-        // Just repeat the same debug loc as last time.
-        Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
-        continue;
-      }
-
-      Vals.push_back(DL->getLine());
-      Vals.push_back(DL->getColumn());
-      Vals.push_back(VE.getMetadataOrNullID(DL->getScope()));
-      Vals.push_back(VE.getMetadataOrNullID(DL->getInlinedAt()));
-      Vals.push_back(DL->isImplicitCode());
-      Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
-      Vals.clear();
-
-      LastDL = DL;
-    }
-
-  // Emit names for all the instructions etc.
-  if (auto *Symtab = F.getValueSymbolTable())
-    writeFunctionLevelValueSymbolTable(*Symtab);
-
-  if (NeedsMetadataAttachment)
-    writeFunctionMetadataAttachment(F);
-  if (VE.shouldPreserveUseListOrder())
-    writeUseListBlock(&F);
-  VE.purgeFunction();
-  Stream.ExitBlock();
-}
-
-// Emit blockinfo, which defines the standard abbreviations etc.
-void ModuleBitcodeWriter::writeBlockInfo() {
-  // We only want to emit block info records for blocks that have multiple
-  // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK.
-  // Other blocks can define their abbrevs inline.
-  Stream.EnterBlockInfoBlock();
-
-  { // 8-bit fixed-width VST_CODE_ENTRY/VST_CODE_BBENTRY strings.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
-    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
-        VST_ENTRY_8_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-
-  { // 7-bit fixed width VST_CODE_ENTRY strings.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
-    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
-        VST_ENTRY_7_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // 6-bit char6 VST_CODE_ENTRY strings.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
-        VST_ENTRY_6_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // 6-bit char6 VST_CODE_BBENTRY strings.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
-        VST_BBENTRY_6_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-
-  { // SETTYPE abbrev for CONSTANTS_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
-                              VE.computeBitsRequiredForTypeIndicies()));
-    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
-        CONSTANTS_SETTYPE_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-
-  { // INTEGER abbrev for CONSTANTS_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
-        CONSTANTS_INTEGER_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-
-  { // CE_CAST abbrev for CONSTANTS_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4));  // cast opc
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,       // typeid
-                              VE.computeBitsRequiredForTypeIndicies()));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));    // value id
-
-    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
-        CONSTANTS_CE_CAST_Abbrev)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // NULL abbrev for CONSTANTS_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
-    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
-        CONSTANTS_NULL_Abbrev)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-
-  // FIXME: This should only use space for first class types!
-
-  { // INST_LOAD abbrev for FUNCTION_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,    // dest ty
-                              VE.computeBitsRequiredForTypeIndicies()));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_LOAD_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // INST_UNOP abbrev for FUNCTION_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNOP));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_UNOP_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // INST_UNOP_FLAGS abbrev for FUNCTION_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNOP));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); // flags
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_UNOP_FLAGS_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // INST_BINOP abbrev for FUNCTION_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_BINOP_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); // flags
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_BINOP_FLAGS_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // INST_CAST abbrev for FUNCTION_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));    // OpVal
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,       // dest ty
-                              VE.computeBitsRequiredForTypeIndicies()));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4));  // opc
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_CAST_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-
-  { // INST_RET abbrev for FUNCTION_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_RET_VOID_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // INST_RET abbrev for FUNCTION_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_RET_VAL_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_UNREACHABLE_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-  {
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_GEP));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty
-                              Log2_32_Ceil(VE.getTypes().size() + 1)));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
-        FUNCTION_INST_GEP_ABBREV)
-      llvm_unreachable("Unexpected abbrev ordering!");
-  }
-
-  Stream.ExitBlock();
-}
-
-/// Write the module path strings, currently only used when generating
-/// a combined index file.
-void IndexBitcodeWriter::writeModStrings() {
-  Stream.EnterSubblock(bitc::MODULE_STRTAB_BLOCK_ID, 3);
-
-  // TODO: See which abbrev sizes we actually need to emit
-
-  // 8-bit fixed-width MST_ENTRY strings.
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
-  unsigned Abbrev8Bit = Stream.EmitAbbrev(std::move(Abbv));
-
-  // 7-bit fixed width MST_ENTRY strings.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
-  unsigned Abbrev7Bit = Stream.EmitAbbrev(std::move(Abbv));
-
-  // 6-bit char6 MST_ENTRY strings.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-  unsigned Abbrev6Bit = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Module Hash, 160 bits SHA1. Optionally, emitted after each MST_CODE_ENTRY.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_HASH));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  unsigned AbbrevHash = Stream.EmitAbbrev(std::move(Abbv));
-
-  SmallVector<unsigned, 64> Vals;
-  forEachModule(
-      [&](const StringMapEntry<std::pair<uint64_t, ModuleHash>> &MPSE) {
-        StringRef Key = MPSE.getKey();
-        const auto &Value = MPSE.getValue();
-        StringEncoding Bits = getStringEncoding(Key);
-        unsigned AbbrevToUse = Abbrev8Bit;
-        if (Bits == SE_Char6)
-          AbbrevToUse = Abbrev6Bit;
-        else if (Bits == SE_Fixed7)
-          AbbrevToUse = Abbrev7Bit;
-
-        Vals.push_back(Value.first);
-        Vals.append(Key.begin(), Key.end());
-
-        // Emit the finished record.
-        Stream.EmitRecord(bitc::MST_CODE_ENTRY, Vals, AbbrevToUse);
-
-        // Emit an optional hash for the module now
-        const auto &Hash = Value.second;
-        if (llvm::any_of(Hash, [](uint32_t H) { return H; })) {
-          Vals.assign(Hash.begin(), Hash.end());
-          // Emit the hash record.
-          Stream.EmitRecord(bitc::MST_CODE_HASH, Vals, AbbrevHash);
-        }
-
-        Vals.clear();
-      });
-  Stream.ExitBlock();
-}
-
-/// Write the function type metadata related records that need to appear before
-/// a function summary entry (whether per-module or combined).
+    Vals.push_back(cast<StoreInst>(I).isVolatile()); 
+    if (cast<StoreInst>(I).isAtomic()) { 
+      Vals.push_back(getEncodedOrdering(cast<StoreInst>(I).getOrdering())); 
+      Vals.push_back( 
+          getEncodedSyncScopeID(cast<StoreInst>(I).getSyncScopeID())); 
+    } 
+    break; 
+  case Instruction::AtomicCmpXchg: 
+    Code = bitc::FUNC_CODE_INST_CMPXCHG; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr 
+    pushValueAndType(I.getOperand(1), InstID, Vals); // cmp. 
+    pushValue(I.getOperand(2), InstID, Vals);        // newval. 
+    Vals.push_back(cast<AtomicCmpXchgInst>(I).isVolatile()); 
+    Vals.push_back( 
+        getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getSuccessOrdering())); 
+    Vals.push_back( 
+        getEncodedSyncScopeID(cast<AtomicCmpXchgInst>(I).getSyncScopeID())); 
+    Vals.push_back( 
+        getEncodedOrdering(cast<AtomicCmpXchgInst>(I).getFailureOrdering())); 
+    Vals.push_back(cast<AtomicCmpXchgInst>(I).isWeak()); 
+    break; 
+  case Instruction::AtomicRMW: 
+    Code = bitc::FUNC_CODE_INST_ATOMICRMW; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); // ptrty + ptr 
+    pushValue(I.getOperand(1), InstID, Vals);        // val. 
+    Vals.push_back( 
+        getEncodedRMWOperation(cast<AtomicRMWInst>(I).getOperation())); 
+    Vals.push_back(cast<AtomicRMWInst>(I).isVolatile()); 
+    Vals.push_back(getEncodedOrdering(cast<AtomicRMWInst>(I).getOrdering())); 
+    Vals.push_back( 
+        getEncodedSyncScopeID(cast<AtomicRMWInst>(I).getSyncScopeID())); 
+    break; 
+  case Instruction::Fence: 
+    Code = bitc::FUNC_CODE_INST_FENCE; 
+    Vals.push_back(getEncodedOrdering(cast<FenceInst>(I).getOrdering())); 
+    Vals.push_back(getEncodedSyncScopeID(cast<FenceInst>(I).getSyncScopeID())); 
+    break; 
+  case Instruction::Call: { 
+    const CallInst &CI = cast<CallInst>(I); 
+    FunctionType *FTy = CI.getFunctionType(); 
+ 
+    if (CI.hasOperandBundles()) 
+      writeOperandBundles(CI, InstID); 
+ 
+    Code = bitc::FUNC_CODE_INST_CALL; 
+ 
+    Vals.push_back(VE.getAttributeListID(CI.getAttributes())); 
+ 
+    unsigned Flags = getOptimizationFlags(&I); 
+    Vals.push_back(CI.getCallingConv() << bitc::CALL_CCONV | 
+                   unsigned(CI.isTailCall()) << bitc::CALL_TAIL | 
+                   unsigned(CI.isMustTailCall()) << bitc::CALL_MUSTTAIL | 
+                   1 << bitc::CALL_EXPLICIT_TYPE | 
+                   unsigned(CI.isNoTailCall()) << bitc::CALL_NOTAIL | 
+                   unsigned(Flags != 0) << bitc::CALL_FMF); 
+    if (Flags != 0) 
+      Vals.push_back(Flags); 
+ 
+    Vals.push_back(VE.getTypeID(FTy)); 
+    pushValueAndType(CI.getCalledOperand(), InstID, Vals); // Callee 
+ 
+    // Emit value #'s for the fixed parameters. 
+    for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 
+      // Check for labels (can happen with asm labels). 
+      if (FTy->getParamType(i)->isLabelTy()) 
+        Vals.push_back(VE.getValueID(CI.getArgOperand(i))); 
+      else 
+        pushValue(CI.getArgOperand(i), InstID, Vals); // fixed param. 
+    } 
+ 
+    // Emit type/value pairs for varargs params. 
+    if (FTy->isVarArg()) { 
+      for (unsigned i = FTy->getNumParams(), e = CI.getNumArgOperands(); 
+           i != e; ++i) 
+        pushValueAndType(CI.getArgOperand(i), InstID, Vals); // varargs 
+    } 
+    break; 
+  } 
+  case Instruction::VAArg: 
+    Code = bitc::FUNC_CODE_INST_VAARG; 
+    Vals.push_back(VE.getTypeID(I.getOperand(0)->getType()));   // valistty 
+    pushValue(I.getOperand(0), InstID, Vals);                   // valist. 
+    Vals.push_back(VE.getTypeID(I.getType())); // restype. 
+    break; 
+  case Instruction::Freeze: 
+    Code = bitc::FUNC_CODE_INST_FREEZE; 
+    pushValueAndType(I.getOperand(0), InstID, Vals); 
+    break; 
+  } 
+ 
+  Stream.EmitRecord(Code, Vals, AbbrevToUse); 
+  Vals.clear(); 
+} 
+ 
+/// Write a GlobalValue VST to the module. The purpose of this data structure is 
+/// to allow clients to efficiently find the function body. 
+void ModuleBitcodeWriter::writeGlobalValueSymbolTable( 
+  DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) { 
+  // Get the offset of the VST we are writing, and backpatch it into 
+  // the VST forward declaration record. 
+  uint64_t VSTOffset = Stream.GetCurrentBitNo(); 
+  // The BitcodeStartBit was the stream offset of the identification block. 
+  VSTOffset -= bitcodeStartBit(); 
+  assert((VSTOffset & 31) == 0 && "VST block not 32-bit aligned"); 
+  // Note that we add 1 here because the offset is relative to one word 
+  // before the start of the identification block, which was historically 
+  // always the start of the regular bitcode header. 
+  Stream.BackpatchWord(VSTOffsetPlaceholder, VSTOffset / 32 + 1); 
+ 
+  Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 
+ 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_FNENTRY)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // value id 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // funcoffset 
+  unsigned FnEntryAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  for (const Function &F : M) { 
+    uint64_t Record[2]; 
+ 
+    if (F.isDeclaration()) 
+      continue; 
+ 
+    Record[0] = VE.getValueID(&F); 
+ 
+    // Save the word offset of the function (from the start of the 
+    // actual bitcode written to the stream). 
+    uint64_t BitcodeIndex = FunctionToBitcodeIndex[&F] - bitcodeStartBit(); 
+    assert((BitcodeIndex & 31) == 0 && "function block not 32-bit aligned"); 
+    // Note that we add 1 here because the offset is relative to one word 
+    // before the start of the identification block, which was historically 
+    // always the start of the regular bitcode header. 
+    Record[1] = BitcodeIndex / 32 + 1; 
+ 
+    Stream.EmitRecord(bitc::VST_CODE_FNENTRY, Record, FnEntryAbbrev); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+/// Emit names for arguments, instructions and basic blocks in a function. 
+void ModuleBitcodeWriter::writeFunctionLevelValueSymbolTable( 
+    const ValueSymbolTable &VST) { 
+  if (VST.empty()) 
+    return; 
+ 
+  Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4); 
+ 
+  // FIXME: Set up the abbrev, we know how many values there are! 
+  // FIXME: We know if the type names can use 7-bit ascii. 
+  SmallVector<uint64_t, 64> NameVals; 
+ 
+  for (const ValueName &Name : VST) { 
+    // Figure out the encoding to use for the name. 
+    StringEncoding Bits = getStringEncoding(Name.getKey()); 
+ 
+    unsigned AbbrevToUse = VST_ENTRY_8_ABBREV; 
+    NameVals.push_back(VE.getValueID(Name.getValue())); 
+ 
+    // VST_CODE_ENTRY:   [valueid, namechar x N] 
+    // VST_CODE_BBENTRY: [bbid, namechar x N] 
+    unsigned Code; 
+    if (isa<BasicBlock>(Name.getValue())) { 
+      Code = bitc::VST_CODE_BBENTRY; 
+      if (Bits == SE_Char6) 
+        AbbrevToUse = VST_BBENTRY_6_ABBREV; 
+    } else { 
+      Code = bitc::VST_CODE_ENTRY; 
+      if (Bits == SE_Char6) 
+        AbbrevToUse = VST_ENTRY_6_ABBREV; 
+      else if (Bits == SE_Fixed7) 
+        AbbrevToUse = VST_ENTRY_7_ABBREV; 
+    } 
+ 
+    for (const auto P : Name.getKey()) 
+      NameVals.push_back((unsigned char)P); 
+ 
+    // Emit the finished record. 
+    Stream.EmitRecord(Code, NameVals, AbbrevToUse); 
+    NameVals.clear(); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::writeUseList(UseListOrder &&Order) { 
+  assert(Order.Shuffle.size() >= 2 && "Shuffle too small"); 
+  unsigned Code; 
+  if (isa<BasicBlock>(Order.V)) 
+    Code = bitc::USELIST_CODE_BB; 
+  else 
+    Code = bitc::USELIST_CODE_DEFAULT; 
+ 
+  SmallVector<uint64_t, 64> Record(Order.Shuffle.begin(), Order.Shuffle.end()); 
+  Record.push_back(VE.getValueID(Order.V)); 
+  Stream.EmitRecord(Code, Record); 
+} 
+ 
+void ModuleBitcodeWriter::writeUseListBlock(const Function *F) { 
+  assert(VE.shouldPreserveUseListOrder() && 
+         "Expected to be preserving use-list order"); 
+ 
+  auto hasMore = [&]() { 
+    return !VE.UseListOrders.empty() && VE.UseListOrders.back().F == F; 
+  }; 
+  if (!hasMore()) 
+    // Nothing to do. 
+    return; 
+ 
+  Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3); 
+  while (hasMore()) { 
+    writeUseList(std::move(VE.UseListOrders.back())); 
+    VE.UseListOrders.pop_back(); 
+  } 
+  Stream.ExitBlock(); 
+} 
+ 
+/// Emit a function body to the module stream. 
+void ModuleBitcodeWriter::writeFunction( 
+    const Function &F, 
+    DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) { 
+  // Save the bitcode index of the start of this function block for recording 
+  // in the VST. 
+  FunctionToBitcodeIndex[&F] = Stream.GetCurrentBitNo(); 
+ 
+  Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4); 
+  VE.incorporateFunction(F); 
+ 
+  SmallVector<unsigned, 64> Vals; 
+ 
+  // Emit the number of basic blocks, so the reader can create them ahead of 
+  // time. 
+  Vals.push_back(VE.getBasicBlocks().size()); 
+  Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals); 
+  Vals.clear(); 
+ 
+  // If there are function-local constants, emit them now. 
+  unsigned CstStart, CstEnd; 
+  VE.getFunctionConstantRange(CstStart, CstEnd); 
+  writeConstants(CstStart, CstEnd, false); 
+ 
+  // If there is function-local metadata, emit it now. 
+  writeFunctionMetadata(F); 
+ 
+  // Keep a running idea of what the instruction ID is. 
+  unsigned InstID = CstEnd; 
+ 
+  bool NeedsMetadataAttachment = F.hasMetadata(); 
+ 
+  DILocation *LastDL = nullptr; 
+  // Finally, emit all the instructions, in order. 
+  for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) 
+    for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); 
+         I != E; ++I) { 
+      writeInstruction(*I, InstID, Vals); 
+ 
+      if (!I->getType()->isVoidTy()) 
+        ++InstID; 
+ 
+      // If the instruction has metadata, write a metadata attachment later. 
+      NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc(); 
+ 
+      // If the instruction has a debug location, emit it. 
+      DILocation *DL = I->getDebugLoc(); 
+      if (!DL) 
+        continue; 
+ 
+      if (DL == LastDL) { 
+        // Just repeat the same debug loc as last time. 
+        Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals); 
+        continue; 
+      } 
+ 
+      Vals.push_back(DL->getLine()); 
+      Vals.push_back(DL->getColumn()); 
+      Vals.push_back(VE.getMetadataOrNullID(DL->getScope())); 
+      Vals.push_back(VE.getMetadataOrNullID(DL->getInlinedAt())); 
+      Vals.push_back(DL->isImplicitCode()); 
+      Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals); 
+      Vals.clear(); 
+ 
+      LastDL = DL; 
+    } 
+ 
+  // Emit names for all the instructions etc. 
+  if (auto *Symtab = F.getValueSymbolTable()) 
+    writeFunctionLevelValueSymbolTable(*Symtab); 
+ 
+  if (NeedsMetadataAttachment) 
+    writeFunctionMetadataAttachment(F); 
+  if (VE.shouldPreserveUseListOrder()) 
+    writeUseListBlock(&F); 
+  VE.purgeFunction(); 
+  Stream.ExitBlock(); 
+} 
+ 
+// Emit blockinfo, which defines the standard abbreviations etc. 
+void ModuleBitcodeWriter::writeBlockInfo() { 
+  // We only want to emit block info records for blocks that have multiple 
+  // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK. 
+  // Other blocks can define their abbrevs inline. 
+  Stream.EnterBlockInfoBlock(); 
+ 
+  { // 8-bit fixed-width VST_CODE_ENTRY/VST_CODE_BBENTRY strings. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) != 
+        VST_ENTRY_8_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+ 
+  { // 7-bit fixed width VST_CODE_ENTRY strings. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) != 
+        VST_ENTRY_7_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // 6-bit char6 VST_CODE_ENTRY strings. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) != 
+        VST_ENTRY_6_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // 6-bit char6 VST_CODE_BBENTRY strings. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) != 
+        VST_BBENTRY_6_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+ 
+  { // SETTYPE abbrev for CONSTANTS_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 
+                              VE.computeBitsRequiredForTypeIndicies())); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) != 
+        CONSTANTS_SETTYPE_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+ 
+  { // INTEGER abbrev for CONSTANTS_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) != 
+        CONSTANTS_INTEGER_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+ 
+  { // CE_CAST abbrev for CONSTANTS_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CE_CAST)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4));  // cast opc 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,       // typeid 
+                              VE.computeBitsRequiredForTypeIndicies())); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));    // value id 
+ 
+    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) != 
+        CONSTANTS_CE_CAST_Abbrev) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // NULL abbrev for CONSTANTS_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL)); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) != 
+        CONSTANTS_NULL_Abbrev) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+ 
+  // FIXME: This should only use space for first class types! 
+ 
+  { // INST_LOAD abbrev for FUNCTION_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,    // dest ty 
+                              VE.computeBitsRequiredForTypeIndicies())); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_LOAD_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // INST_UNOP abbrev for FUNCTION_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNOP)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_UNOP_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // INST_UNOP_FLAGS abbrev for FUNCTION_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNOP)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); // flags 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_UNOP_FLAGS_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // INST_BINOP abbrev for FUNCTION_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_BINOP_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // INST_BINOP_FLAGS abbrev for FUNCTION_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_BINOP)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); // flags 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_BINOP_FLAGS_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // INST_CAST abbrev for FUNCTION_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_CAST)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));    // OpVal 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,       // dest ty 
+                              VE.computeBitsRequiredForTypeIndicies())); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4));  // opc 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_CAST_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+ 
+  { // INST_RET abbrev for FUNCTION_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_RET_VOID_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // INST_RET abbrev for FUNCTION_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_RET_VAL_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK. 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE)); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_UNREACHABLE_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+  { 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_GEP)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // dest ty 
+                              Log2_32_Ceil(VE.getTypes().size() + 1))); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) != 
+        FUNCTION_INST_GEP_ABBREV) 
+      llvm_unreachable("Unexpected abbrev ordering!"); 
+  } 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+/// Write the module path strings, currently only used when generating 
+/// a combined index file. 
+void IndexBitcodeWriter::writeModStrings() { 
+  Stream.EnterSubblock(bitc::MODULE_STRTAB_BLOCK_ID, 3); 
+ 
+  // TODO: See which abbrev sizes we actually need to emit 
+ 
+  // 8-bit fixed-width MST_ENTRY strings. 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8)); 
+  unsigned Abbrev8Bit = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // 7-bit fixed width MST_ENTRY strings. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); 
+  unsigned Abbrev7Bit = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // 6-bit char6 MST_ENTRY strings. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_ENTRY)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 
+  unsigned Abbrev6Bit = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Module Hash, 160 bits SHA1. Optionally, emitted after each MST_CODE_ENTRY. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::MST_CODE_HASH)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); 
+  unsigned AbbrevHash = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  SmallVector<unsigned, 64> Vals; 
+  forEachModule( 
+      [&](const StringMapEntry<std::pair<uint64_t, ModuleHash>> &MPSE) { 
+        StringRef Key = MPSE.getKey(); 
+        const auto &Value = MPSE.getValue(); 
+        StringEncoding Bits = getStringEncoding(Key); 
+        unsigned AbbrevToUse = Abbrev8Bit; 
+        if (Bits == SE_Char6) 
+          AbbrevToUse = Abbrev6Bit; 
+        else if (Bits == SE_Fixed7) 
+          AbbrevToUse = Abbrev7Bit; 
+ 
+        Vals.push_back(Value.first); 
+        Vals.append(Key.begin(), Key.end()); 
+ 
+        // Emit the finished record. 
+        Stream.EmitRecord(bitc::MST_CODE_ENTRY, Vals, AbbrevToUse); 
+ 
+        // Emit an optional hash for the module now 
+        const auto &Hash = Value.second; 
+        if (llvm::any_of(Hash, [](uint32_t H) { return H; })) { 
+          Vals.assign(Hash.begin(), Hash.end()); 
+          // Emit the hash record. 
+          Stream.EmitRecord(bitc::MST_CODE_HASH, Vals, AbbrevHash); 
+        } 
+ 
+        Vals.clear(); 
+      }); 
+  Stream.ExitBlock(); 
+} 
+ 
+/// Write the function type metadata related records that need to appear before 
+/// a function summary entry (whether per-module or combined). 
 template <typename Fn>
-static void writeFunctionTypeMetadataRecords(BitstreamWriter &Stream,
+static void writeFunctionTypeMetadataRecords(BitstreamWriter &Stream, 
                                              FunctionSummary *FS,
                                              Fn GetValueID) {
-  if (!FS->type_tests().empty())
-    Stream.EmitRecord(bitc::FS_TYPE_TESTS, FS->type_tests());
-
-  SmallVector<uint64_t, 64> Record;
-
-  auto WriteVFuncIdVec = [&](uint64_t Ty,
-                             ArrayRef<FunctionSummary::VFuncId> VFs) {
-    if (VFs.empty())
-      return;
-    Record.clear();
-    for (auto &VF : VFs) {
-      Record.push_back(VF.GUID);
-      Record.push_back(VF.Offset);
-    }
-    Stream.EmitRecord(Ty, Record);
-  };
-
-  WriteVFuncIdVec(bitc::FS_TYPE_TEST_ASSUME_VCALLS,
-                  FS->type_test_assume_vcalls());
-  WriteVFuncIdVec(bitc::FS_TYPE_CHECKED_LOAD_VCALLS,
-                  FS->type_checked_load_vcalls());
-
-  auto WriteConstVCallVec = [&](uint64_t Ty,
-                                ArrayRef<FunctionSummary::ConstVCall> VCs) {
-    for (auto &VC : VCs) {
-      Record.clear();
-      Record.push_back(VC.VFunc.GUID);
-      Record.push_back(VC.VFunc.Offset);
+  if (!FS->type_tests().empty()) 
+    Stream.EmitRecord(bitc::FS_TYPE_TESTS, FS->type_tests()); 
+ 
+  SmallVector<uint64_t, 64> Record; 
+ 
+  auto WriteVFuncIdVec = [&](uint64_t Ty, 
+                             ArrayRef<FunctionSummary::VFuncId> VFs) { 
+    if (VFs.empty()) 
+      return; 
+    Record.clear(); 
+    for (auto &VF : VFs) { 
+      Record.push_back(VF.GUID); 
+      Record.push_back(VF.Offset); 
+    } 
+    Stream.EmitRecord(Ty, Record); 
+  }; 
+ 
+  WriteVFuncIdVec(bitc::FS_TYPE_TEST_ASSUME_VCALLS, 
+                  FS->type_test_assume_vcalls()); 
+  WriteVFuncIdVec(bitc::FS_TYPE_CHECKED_LOAD_VCALLS, 
+                  FS->type_checked_load_vcalls()); 
+ 
+  auto WriteConstVCallVec = [&](uint64_t Ty, 
+                                ArrayRef<FunctionSummary::ConstVCall> VCs) { 
+    for (auto &VC : VCs) { 
+      Record.clear(); 
+      Record.push_back(VC.VFunc.GUID); 
+      Record.push_back(VC.VFunc.Offset); 
       llvm::append_range(Record, VC.Args);
-      Stream.EmitRecord(Ty, Record);
-    }
-  };
-
-  WriteConstVCallVec(bitc::FS_TYPE_TEST_ASSUME_CONST_VCALL,
-                     FS->type_test_assume_const_vcalls());
-  WriteConstVCallVec(bitc::FS_TYPE_CHECKED_LOAD_CONST_VCALL,
-                     FS->type_checked_load_const_vcalls());
-
-  auto WriteRange = [&](ConstantRange Range) {
-    Range = Range.sextOrTrunc(FunctionSummary::ParamAccess::RangeWidth);
-    assert(Range.getLower().getNumWords() == 1);
-    assert(Range.getUpper().getNumWords() == 1);
-    emitSignedInt64(Record, *Range.getLower().getRawData());
-    emitSignedInt64(Record, *Range.getUpper().getRawData());
-  };
-
-  if (!FS->paramAccesses().empty()) {
-    Record.clear();
-    for (auto &Arg : FS->paramAccesses()) {
+      Stream.EmitRecord(Ty, Record); 
+    } 
+  }; 
+ 
+  WriteConstVCallVec(bitc::FS_TYPE_TEST_ASSUME_CONST_VCALL, 
+                     FS->type_test_assume_const_vcalls()); 
+  WriteConstVCallVec(bitc::FS_TYPE_CHECKED_LOAD_CONST_VCALL, 
+                     FS->type_checked_load_const_vcalls()); 
+ 
+  auto WriteRange = [&](ConstantRange Range) { 
+    Range = Range.sextOrTrunc(FunctionSummary::ParamAccess::RangeWidth); 
+    assert(Range.getLower().getNumWords() == 1); 
+    assert(Range.getUpper().getNumWords() == 1); 
+    emitSignedInt64(Record, *Range.getLower().getRawData()); 
+    emitSignedInt64(Record, *Range.getUpper().getRawData()); 
+  }; 
+ 
+  if (!FS->paramAccesses().empty()) { 
+    Record.clear(); 
+    for (auto &Arg : FS->paramAccesses()) { 
       size_t UndoSize = Record.size();
-      Record.push_back(Arg.ParamNo);
-      WriteRange(Arg.Use);
-      Record.push_back(Arg.Calls.size());
-      for (auto &Call : Arg.Calls) {
-        Record.push_back(Call.ParamNo);
+      Record.push_back(Arg.ParamNo); 
+      WriteRange(Arg.Use); 
+      Record.push_back(Arg.Calls.size()); 
+      for (auto &Call : Arg.Calls) { 
+        Record.push_back(Call.ParamNo); 
         Optional<unsigned> ValueID = GetValueID(Call.Callee);
         if (!ValueID) {
           // If ValueID is unknown we can't drop just this call, we must drop
@@ -3666,488 +3666,488 @@ static void writeFunctionTypeMetadataRecords(BitstreamWriter &Stream,
           break;
         }
         Record.push_back(*ValueID);
-        WriteRange(Call.Offsets);
-      }
-    }
+        WriteRange(Call.Offsets); 
+      } 
+    } 
     if (!Record.empty())
       Stream.EmitRecord(bitc::FS_PARAM_ACCESS, Record);
-  }
-}
-
-/// Collect type IDs from type tests used by function.
-static void
-getReferencedTypeIds(FunctionSummary *FS,
-                     std::set<GlobalValue::GUID> &ReferencedTypeIds) {
-  if (!FS->type_tests().empty())
-    for (auto &TT : FS->type_tests())
-      ReferencedTypeIds.insert(TT);
-
-  auto GetReferencedTypesFromVFuncIdVec =
-      [&](ArrayRef<FunctionSummary::VFuncId> VFs) {
-        for (auto &VF : VFs)
-          ReferencedTypeIds.insert(VF.GUID);
-      };
-
-  GetReferencedTypesFromVFuncIdVec(FS->type_test_assume_vcalls());
-  GetReferencedTypesFromVFuncIdVec(FS->type_checked_load_vcalls());
-
-  auto GetReferencedTypesFromConstVCallVec =
-      [&](ArrayRef<FunctionSummary::ConstVCall> VCs) {
-        for (auto &VC : VCs)
-          ReferencedTypeIds.insert(VC.VFunc.GUID);
-      };
-
-  GetReferencedTypesFromConstVCallVec(FS->type_test_assume_const_vcalls());
-  GetReferencedTypesFromConstVCallVec(FS->type_checked_load_const_vcalls());
-}
-
-static void writeWholeProgramDevirtResolutionByArg(
-    SmallVector<uint64_t, 64> &NameVals, const std::vector<uint64_t> &args,
-    const WholeProgramDevirtResolution::ByArg &ByArg) {
-  NameVals.push_back(args.size());
+  } 
+} 
+ 
+/// Collect type IDs from type tests used by function. 
+static void 
+getReferencedTypeIds(FunctionSummary *FS, 
+                     std::set<GlobalValue::GUID> &ReferencedTypeIds) { 
+  if (!FS->type_tests().empty()) 
+    for (auto &TT : FS->type_tests()) 
+      ReferencedTypeIds.insert(TT); 
+ 
+  auto GetReferencedTypesFromVFuncIdVec = 
+      [&](ArrayRef<FunctionSummary::VFuncId> VFs) { 
+        for (auto &VF : VFs) 
+          ReferencedTypeIds.insert(VF.GUID); 
+      }; 
+ 
+  GetReferencedTypesFromVFuncIdVec(FS->type_test_assume_vcalls()); 
+  GetReferencedTypesFromVFuncIdVec(FS->type_checked_load_vcalls()); 
+ 
+  auto GetReferencedTypesFromConstVCallVec = 
+      [&](ArrayRef<FunctionSummary::ConstVCall> VCs) { 
+        for (auto &VC : VCs) 
+          ReferencedTypeIds.insert(VC.VFunc.GUID); 
+      }; 
+ 
+  GetReferencedTypesFromConstVCallVec(FS->type_test_assume_const_vcalls()); 
+  GetReferencedTypesFromConstVCallVec(FS->type_checked_load_const_vcalls()); 
+} 
+ 
+static void writeWholeProgramDevirtResolutionByArg( 
+    SmallVector<uint64_t, 64> &NameVals, const std::vector<uint64_t> &args, 
+    const WholeProgramDevirtResolution::ByArg &ByArg) { 
+  NameVals.push_back(args.size()); 
   llvm::append_range(NameVals, args);
-
-  NameVals.push_back(ByArg.TheKind);
-  NameVals.push_back(ByArg.Info);
-  NameVals.push_back(ByArg.Byte);
-  NameVals.push_back(ByArg.Bit);
-}
-
-static void writeWholeProgramDevirtResolution(
-    SmallVector<uint64_t, 64> &NameVals, StringTableBuilder &StrtabBuilder,
-    uint64_t Id, const WholeProgramDevirtResolution &Wpd) {
-  NameVals.push_back(Id);
-
-  NameVals.push_back(Wpd.TheKind);
-  NameVals.push_back(StrtabBuilder.add(Wpd.SingleImplName));
-  NameVals.push_back(Wpd.SingleImplName.size());
-
-  NameVals.push_back(Wpd.ResByArg.size());
-  for (auto &A : Wpd.ResByArg)
-    writeWholeProgramDevirtResolutionByArg(NameVals, A.first, A.second);
-}
-
-static void writeTypeIdSummaryRecord(SmallVector<uint64_t, 64> &NameVals,
-                                     StringTableBuilder &StrtabBuilder,
-                                     const std::string &Id,
-                                     const TypeIdSummary &Summary) {
-  NameVals.push_back(StrtabBuilder.add(Id));
-  NameVals.push_back(Id.size());
-
-  NameVals.push_back(Summary.TTRes.TheKind);
-  NameVals.push_back(Summary.TTRes.SizeM1BitWidth);
-  NameVals.push_back(Summary.TTRes.AlignLog2);
-  NameVals.push_back(Summary.TTRes.SizeM1);
-  NameVals.push_back(Summary.TTRes.BitMask);
-  NameVals.push_back(Summary.TTRes.InlineBits);
-
-  for (auto &W : Summary.WPDRes)
-    writeWholeProgramDevirtResolution(NameVals, StrtabBuilder, W.first,
-                                      W.second);
-}
-
-static void writeTypeIdCompatibleVtableSummaryRecord(
-    SmallVector<uint64_t, 64> &NameVals, StringTableBuilder &StrtabBuilder,
-    const std::string &Id, const TypeIdCompatibleVtableInfo &Summary,
-    ValueEnumerator &VE) {
-  NameVals.push_back(StrtabBuilder.add(Id));
-  NameVals.push_back(Id.size());
-
-  for (auto &P : Summary) {
-    NameVals.push_back(P.AddressPointOffset);
-    NameVals.push_back(VE.getValueID(P.VTableVI.getValue()));
-  }
-}
-
-// Helper to emit a single function summary record.
-void ModuleBitcodeWriterBase::writePerModuleFunctionSummaryRecord(
-    SmallVector<uint64_t, 64> &NameVals, GlobalValueSummary *Summary,
-    unsigned ValueID, unsigned FSCallsAbbrev, unsigned FSCallsProfileAbbrev,
-    const Function &F) {
-  NameVals.push_back(ValueID);
-
-  FunctionSummary *FS = cast<FunctionSummary>(Summary);
-
+ 
+  NameVals.push_back(ByArg.TheKind); 
+  NameVals.push_back(ByArg.Info); 
+  NameVals.push_back(ByArg.Byte); 
+  NameVals.push_back(ByArg.Bit); 
+} 
+ 
+static void writeWholeProgramDevirtResolution( 
+    SmallVector<uint64_t, 64> &NameVals, StringTableBuilder &StrtabBuilder, 
+    uint64_t Id, const WholeProgramDevirtResolution &Wpd) { 
+  NameVals.push_back(Id); 
+ 
+  NameVals.push_back(Wpd.TheKind); 
+  NameVals.push_back(StrtabBuilder.add(Wpd.SingleImplName)); 
+  NameVals.push_back(Wpd.SingleImplName.size()); 
+ 
+  NameVals.push_back(Wpd.ResByArg.size()); 
+  for (auto &A : Wpd.ResByArg) 
+    writeWholeProgramDevirtResolutionByArg(NameVals, A.first, A.second); 
+} 
+ 
+static void writeTypeIdSummaryRecord(SmallVector<uint64_t, 64> &NameVals, 
+                                     StringTableBuilder &StrtabBuilder, 
+                                     const std::string &Id, 
+                                     const TypeIdSummary &Summary) { 
+  NameVals.push_back(StrtabBuilder.add(Id)); 
+  NameVals.push_back(Id.size()); 
+ 
+  NameVals.push_back(Summary.TTRes.TheKind); 
+  NameVals.push_back(Summary.TTRes.SizeM1BitWidth); 
+  NameVals.push_back(Summary.TTRes.AlignLog2); 
+  NameVals.push_back(Summary.TTRes.SizeM1); 
+  NameVals.push_back(Summary.TTRes.BitMask); 
+  NameVals.push_back(Summary.TTRes.InlineBits); 
+ 
+  for (auto &W : Summary.WPDRes) 
+    writeWholeProgramDevirtResolution(NameVals, StrtabBuilder, W.first, 
+                                      W.second); 
+} 
+ 
+static void writeTypeIdCompatibleVtableSummaryRecord( 
+    SmallVector<uint64_t, 64> &NameVals, StringTableBuilder &StrtabBuilder, 
+    const std::string &Id, const TypeIdCompatibleVtableInfo &Summary, 
+    ValueEnumerator &VE) { 
+  NameVals.push_back(StrtabBuilder.add(Id)); 
+  NameVals.push_back(Id.size()); 
+ 
+  for (auto &P : Summary) { 
+    NameVals.push_back(P.AddressPointOffset); 
+    NameVals.push_back(VE.getValueID(P.VTableVI.getValue())); 
+  } 
+} 
+ 
+// Helper to emit a single function summary record. 
+void ModuleBitcodeWriterBase::writePerModuleFunctionSummaryRecord( 
+    SmallVector<uint64_t, 64> &NameVals, GlobalValueSummary *Summary, 
+    unsigned ValueID, unsigned FSCallsAbbrev, unsigned FSCallsProfileAbbrev, 
+    const Function &F) { 
+  NameVals.push_back(ValueID); 
+ 
+  FunctionSummary *FS = cast<FunctionSummary>(Summary); 
+ 
   writeFunctionTypeMetadataRecords(
       Stream, FS, [&](const ValueInfo &VI) -> Optional<unsigned> {
         return {VE.getValueID(VI.getValue())};
       });
 
-  auto SpecialRefCnts = FS->specialRefCounts();
-  NameVals.push_back(getEncodedGVSummaryFlags(FS->flags()));
-  NameVals.push_back(FS->instCount());
-  NameVals.push_back(getEncodedFFlags(FS->fflags()));
-  NameVals.push_back(FS->refs().size());
-  NameVals.push_back(SpecialRefCnts.first);  // rorefcnt
-  NameVals.push_back(SpecialRefCnts.second); // worefcnt
-
-  for (auto &RI : FS->refs())
-    NameVals.push_back(VE.getValueID(RI.getValue()));
-
-  bool HasProfileData =
-      F.hasProfileData() || ForceSummaryEdgesCold != FunctionSummary::FSHT_None;
-  for (auto &ECI : FS->calls()) {
-    NameVals.push_back(getValueId(ECI.first));
-    if (HasProfileData)
-      NameVals.push_back(static_cast<uint8_t>(ECI.second.Hotness));
-    else if (WriteRelBFToSummary)
-      NameVals.push_back(ECI.second.RelBlockFreq);
-  }
-
-  unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev);
-  unsigned Code =
-      (HasProfileData ? bitc::FS_PERMODULE_PROFILE
-                      : (WriteRelBFToSummary ? bitc::FS_PERMODULE_RELBF
-                                             : bitc::FS_PERMODULE));
-
-  // Emit the finished record.
-  Stream.EmitRecord(Code, NameVals, FSAbbrev);
-  NameVals.clear();
-}
-
-// Collect the global value references in the given variable's initializer,
-// and emit them in a summary record.
-void ModuleBitcodeWriterBase::writeModuleLevelReferences(
-    const GlobalVariable &V, SmallVector<uint64_t, 64> &NameVals,
-    unsigned FSModRefsAbbrev, unsigned FSModVTableRefsAbbrev) {
-  auto VI = Index->getValueInfo(V.getGUID());
-  if (!VI || VI.getSummaryList().empty()) {
-    // Only declarations should not have a summary (a declaration might however
-    // have a summary if the def was in module level asm).
-    assert(V.isDeclaration());
-    return;
-  }
-  auto *Summary = VI.getSummaryList()[0].get();
-  NameVals.push_back(VE.getValueID(&V));
-  GlobalVarSummary *VS = cast<GlobalVarSummary>(Summary);
-  NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
-  NameVals.push_back(getEncodedGVarFlags(VS->varflags()));
-
-  auto VTableFuncs = VS->vTableFuncs();
-  if (!VTableFuncs.empty())
-    NameVals.push_back(VS->refs().size());
-
-  unsigned SizeBeforeRefs = NameVals.size();
-  for (auto &RI : VS->refs())
-    NameVals.push_back(VE.getValueID(RI.getValue()));
-  // Sort the refs for determinism output, the vector returned by FS->refs() has
-  // been initialized from a DenseSet.
+  auto SpecialRefCnts = FS->specialRefCounts(); 
+  NameVals.push_back(getEncodedGVSummaryFlags(FS->flags())); 
+  NameVals.push_back(FS->instCount()); 
+  NameVals.push_back(getEncodedFFlags(FS->fflags())); 
+  NameVals.push_back(FS->refs().size()); 
+  NameVals.push_back(SpecialRefCnts.first);  // rorefcnt 
+  NameVals.push_back(SpecialRefCnts.second); // worefcnt 
+ 
+  for (auto &RI : FS->refs()) 
+    NameVals.push_back(VE.getValueID(RI.getValue())); 
+ 
+  bool HasProfileData = 
+      F.hasProfileData() || ForceSummaryEdgesCold != FunctionSummary::FSHT_None; 
+  for (auto &ECI : FS->calls()) { 
+    NameVals.push_back(getValueId(ECI.first)); 
+    if (HasProfileData) 
+      NameVals.push_back(static_cast<uint8_t>(ECI.second.Hotness)); 
+    else if (WriteRelBFToSummary) 
+      NameVals.push_back(ECI.second.RelBlockFreq); 
+  } 
+ 
+  unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev); 
+  unsigned Code = 
+      (HasProfileData ? bitc::FS_PERMODULE_PROFILE 
+                      : (WriteRelBFToSummary ? bitc::FS_PERMODULE_RELBF 
+                                             : bitc::FS_PERMODULE)); 
+ 
+  // Emit the finished record. 
+  Stream.EmitRecord(Code, NameVals, FSAbbrev); 
+  NameVals.clear(); 
+} 
+ 
+// Collect the global value references in the given variable's initializer, 
+// and emit them in a summary record. 
+void ModuleBitcodeWriterBase::writeModuleLevelReferences( 
+    const GlobalVariable &V, SmallVector<uint64_t, 64> &NameVals, 
+    unsigned FSModRefsAbbrev, unsigned FSModVTableRefsAbbrev) { 
+  auto VI = Index->getValueInfo(V.getGUID()); 
+  if (!VI || VI.getSummaryList().empty()) { 
+    // Only declarations should not have a summary (a declaration might however 
+    // have a summary if the def was in module level asm). 
+    assert(V.isDeclaration()); 
+    return; 
+  } 
+  auto *Summary = VI.getSummaryList()[0].get(); 
+  NameVals.push_back(VE.getValueID(&V)); 
+  GlobalVarSummary *VS = cast<GlobalVarSummary>(Summary); 
+  NameVals.push_back(getEncodedGVSummaryFlags(VS->flags())); 
+  NameVals.push_back(getEncodedGVarFlags(VS->varflags())); 
+ 
+  auto VTableFuncs = VS->vTableFuncs(); 
+  if (!VTableFuncs.empty()) 
+    NameVals.push_back(VS->refs().size()); 
+ 
+  unsigned SizeBeforeRefs = NameVals.size(); 
+  for (auto &RI : VS->refs()) 
+    NameVals.push_back(VE.getValueID(RI.getValue())); 
+  // Sort the refs for determinism output, the vector returned by FS->refs() has 
+  // been initialized from a DenseSet. 
   llvm::sort(drop_begin(NameVals, SizeBeforeRefs));
-
-  if (VTableFuncs.empty())
-    Stream.EmitRecord(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS, NameVals,
-                      FSModRefsAbbrev);
-  else {
-    // VTableFuncs pairs should already be sorted by offset.
-    for (auto &P : VTableFuncs) {
-      NameVals.push_back(VE.getValueID(P.FuncVI.getValue()));
-      NameVals.push_back(P.VTableOffset);
-    }
-
-    Stream.EmitRecord(bitc::FS_PERMODULE_VTABLE_GLOBALVAR_INIT_REFS, NameVals,
-                      FSModVTableRefsAbbrev);
-  }
-  NameVals.clear();
-}
-
-/// Emit the per-module summary section alongside the rest of
-/// the module's bitcode.
-void ModuleBitcodeWriterBase::writePerModuleGlobalValueSummary() {
-  // By default we compile with ThinLTO if the module has a summary, but the
-  // client can request full LTO with a module flag.
-  bool IsThinLTO = true;
-  if (auto *MD =
-          mdconst::extract_or_null<ConstantInt>(M.getModuleFlag("ThinLTO")))
-    IsThinLTO = MD->getZExtValue();
-  Stream.EnterSubblock(IsThinLTO ? bitc::GLOBALVAL_SUMMARY_BLOCK_ID
-                                 : bitc::FULL_LTO_GLOBALVAL_SUMMARY_BLOCK_ID,
-                       4);
-
-  Stream.EmitRecord(
-      bitc::FS_VERSION,
-      ArrayRef<uint64_t>{ModuleSummaryIndex::BitcodeSummaryVersion});
-
-  // Write the index flags.
-  uint64_t Flags = 0;
-  // Bits 1-3 are set only in the combined index, skip them.
-  if (Index->enableSplitLTOUnit())
-    Flags |= 0x8;
-  Stream.EmitRecord(bitc::FS_FLAGS, ArrayRef<uint64_t>{Flags});
-
-  if (Index->begin() == Index->end()) {
-    Stream.ExitBlock();
-    return;
-  }
-
-  for (const auto &GVI : valueIds()) {
-    Stream.EmitRecord(bitc::FS_VALUE_GUID,
-                      ArrayRef<uint64_t>{GVI.second, GVI.first});
-  }
-
-  // Abbrev for FS_PERMODULE_PROFILE.
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_PROFILE));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // instcount
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // fflags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // numrefs
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // rorefcnt
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // worefcnt
-  // numrefs x valueid, n x (valueid, hotness)
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for FS_PERMODULE or FS_PERMODULE_RELBF.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  if (WriteRelBFToSummary)
-    Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_RELBF));
-  else
-    Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // instcount
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // fflags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // numrefs
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // rorefcnt
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // worefcnt
-  // numrefs x valueid, n x (valueid [, rel_block_freq])
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for FS_PERMODULE_GLOBALVAR_INIT_REFS.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));  // valueids
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for FS_PERMODULE_VTABLE_GLOBALVAR_INIT_REFS.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_VTABLE_GLOBALVAR_INIT_REFS));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs
-  // numrefs x valueid, n x (valueid , offset)
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSModVTableRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for FS_ALIAS.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::FS_ALIAS));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for FS_TYPE_ID_METADATA
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::FS_TYPE_ID_METADATA));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // typeid strtab index
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // typeid length
-  // n x (valueid , offset)
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned TypeIdCompatibleVtableAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  SmallVector<uint64_t, 64> NameVals;
-  // Iterate over the list of functions instead of the Index to
-  // ensure the ordering is stable.
-  for (const Function &F : M) {
-    // Summary emission does not support anonymous functions, they have to
-    // renamed using the anonymous function renaming pass.
-    if (!F.hasName())
-      report_fatal_error("Unexpected anonymous function when writing summary");
-
-    ValueInfo VI = Index->getValueInfo(F.getGUID());
-    if (!VI || VI.getSummaryList().empty()) {
-      // Only declarations should not have a summary (a declaration might
-      // however have a summary if the def was in module level asm).
-      assert(F.isDeclaration());
-      continue;
-    }
-    auto *Summary = VI.getSummaryList()[0].get();
-    writePerModuleFunctionSummaryRecord(NameVals, Summary, VE.getValueID(&F),
-                                        FSCallsAbbrev, FSCallsProfileAbbrev, F);
-  }
-
-  // Capture references from GlobalVariable initializers, which are outside
-  // of a function scope.
-  for (const GlobalVariable &G : M.globals())
-    writeModuleLevelReferences(G, NameVals, FSModRefsAbbrev,
-                               FSModVTableRefsAbbrev);
-
-  for (const GlobalAlias &A : M.aliases()) {
-    auto *Aliasee = A.getBaseObject();
-    if (!Aliasee->hasName())
-      // Nameless function don't have an entry in the summary, skip it.
-      continue;
-    auto AliasId = VE.getValueID(&A);
-    auto AliaseeId = VE.getValueID(Aliasee);
-    NameVals.push_back(AliasId);
-    auto *Summary = Index->getGlobalValueSummary(A);
-    AliasSummary *AS = cast<AliasSummary>(Summary);
-    NameVals.push_back(getEncodedGVSummaryFlags(AS->flags()));
-    NameVals.push_back(AliaseeId);
-    Stream.EmitRecord(bitc::FS_ALIAS, NameVals, FSAliasAbbrev);
-    NameVals.clear();
-  }
-
-  for (auto &S : Index->typeIdCompatibleVtableMap()) {
-    writeTypeIdCompatibleVtableSummaryRecord(NameVals, StrtabBuilder, S.first,
-                                             S.second, VE);
-    Stream.EmitRecord(bitc::FS_TYPE_ID_METADATA, NameVals,
-                      TypeIdCompatibleVtableAbbrev);
-    NameVals.clear();
-  }
-
-  Stream.EmitRecord(bitc::FS_BLOCK_COUNT,
-                    ArrayRef<uint64_t>{Index->getBlockCount()});
-
-  Stream.ExitBlock();
-}
-
-/// Emit the combined summary section into the combined index file.
-void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
-  Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
-  Stream.EmitRecord(
-      bitc::FS_VERSION,
-      ArrayRef<uint64_t>{ModuleSummaryIndex::BitcodeSummaryVersion});
-
-  // Write the index flags.
-  Stream.EmitRecord(bitc::FS_FLAGS, ArrayRef<uint64_t>{Index.getFlags()});
-
-  for (const auto &GVI : valueIds()) {
-    Stream.EmitRecord(bitc::FS_VALUE_GUID,
-                      ArrayRef<uint64_t>{GVI.second, GVI.first});
-  }
-
-  // Abbrev for FS_COMBINED.
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // modid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // instcount
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // fflags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // entrycount
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // numrefs
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // rorefcnt
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // worefcnt
-  // numrefs x valueid, n x (valueid)
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for FS_COMBINED_PROFILE.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_PROFILE));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // modid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // instcount
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // fflags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // entrycount
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // numrefs
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // rorefcnt
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // worefcnt
-  // numrefs x valueid, n x (valueid, hotness)
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for FS_COMBINED_GLOBALVAR_INIT_REFS.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // modid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));    // valueids
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // Abbrev for FS_COMBINED_ALIAS.
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_ALIAS));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // modid
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-  // The aliases are emitted as a post-pass, and will point to the value
-  // id of the aliasee. Save them in a vector for post-processing.
-  SmallVector<AliasSummary *, 64> Aliases;
-
-  // Save the value id for each summary for alias emission.
-  DenseMap<const GlobalValueSummary *, unsigned> SummaryToValueIdMap;
-
-  SmallVector<uint64_t, 64> NameVals;
-
-  // Set that will be populated during call to writeFunctionTypeMetadataRecords
-  // with the type ids referenced by this index file.
-  std::set<GlobalValue::GUID> ReferencedTypeIds;
-
-  // For local linkage, we also emit the original name separately
-  // immediately after the record.
-  auto MaybeEmitOriginalName = [&](GlobalValueSummary &S) {
-    if (!GlobalValue::isLocalLinkage(S.linkage()))
-      return;
-    NameVals.push_back(S.getOriginalName());
-    Stream.EmitRecord(bitc::FS_COMBINED_ORIGINAL_NAME, NameVals);
-    NameVals.clear();
-  };
-
-  std::set<GlobalValue::GUID> DefOrUseGUIDs;
-  forEachSummary([&](GVInfo I, bool IsAliasee) {
-    GlobalValueSummary *S = I.second;
-    assert(S);
-    DefOrUseGUIDs.insert(I.first);
-    for (const ValueInfo &VI : S->refs())
-      DefOrUseGUIDs.insert(VI.getGUID());
-
-    auto ValueId = getValueId(I.first);
-    assert(ValueId);
-    SummaryToValueIdMap[S] = *ValueId;
-
-    // If this is invoked for an aliasee, we want to record the above
-    // mapping, but then not emit a summary entry (if the aliasee is
-    // to be imported, we will invoke this separately with IsAliasee=false).
-    if (IsAliasee)
-      return;
-
-    if (auto *AS = dyn_cast<AliasSummary>(S)) {
-      // Will process aliases as a post-pass because the reader wants all
-      // global to be loaded first.
-      Aliases.push_back(AS);
-      return;
-    }
-
-    if (auto *VS = dyn_cast<GlobalVarSummary>(S)) {
-      NameVals.push_back(*ValueId);
-      NameVals.push_back(Index.getModuleId(VS->modulePath()));
-      NameVals.push_back(getEncodedGVSummaryFlags(VS->flags()));
-      NameVals.push_back(getEncodedGVarFlags(VS->varflags()));
-      for (auto &RI : VS->refs()) {
-        auto RefValueId = getValueId(RI.getGUID());
-        if (!RefValueId)
-          continue;
-        NameVals.push_back(*RefValueId);
-      }
-
-      // Emit the finished record.
-      Stream.EmitRecord(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS, NameVals,
-                        FSModRefsAbbrev);
-      NameVals.clear();
-      MaybeEmitOriginalName(*S);
-      return;
-    }
-
+ 
+  if (VTableFuncs.empty()) 
+    Stream.EmitRecord(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS, NameVals, 
+                      FSModRefsAbbrev); 
+  else { 
+    // VTableFuncs pairs should already be sorted by offset. 
+    for (auto &P : VTableFuncs) { 
+      NameVals.push_back(VE.getValueID(P.FuncVI.getValue())); 
+      NameVals.push_back(P.VTableOffset); 
+    } 
+ 
+    Stream.EmitRecord(bitc::FS_PERMODULE_VTABLE_GLOBALVAR_INIT_REFS, NameVals, 
+                      FSModVTableRefsAbbrev); 
+  } 
+  NameVals.clear(); 
+} 
+ 
+/// Emit the per-module summary section alongside the rest of 
+/// the module's bitcode. 
+void ModuleBitcodeWriterBase::writePerModuleGlobalValueSummary() { 
+  // By default we compile with ThinLTO if the module has a summary, but the 
+  // client can request full LTO with a module flag. 
+  bool IsThinLTO = true; 
+  if (auto *MD = 
+          mdconst::extract_or_null<ConstantInt>(M.getModuleFlag("ThinLTO"))) 
+    IsThinLTO = MD->getZExtValue(); 
+  Stream.EnterSubblock(IsThinLTO ? bitc::GLOBALVAL_SUMMARY_BLOCK_ID 
+                                 : bitc::FULL_LTO_GLOBALVAL_SUMMARY_BLOCK_ID, 
+                       4); 
+ 
+  Stream.EmitRecord( 
+      bitc::FS_VERSION, 
+      ArrayRef<uint64_t>{ModuleSummaryIndex::BitcodeSummaryVersion}); 
+ 
+  // Write the index flags. 
+  uint64_t Flags = 0; 
+  // Bits 1-3 are set only in the combined index, skip them. 
+  if (Index->enableSplitLTOUnit()) 
+    Flags |= 0x8; 
+  Stream.EmitRecord(bitc::FS_FLAGS, ArrayRef<uint64_t>{Flags}); 
+ 
+  if (Index->begin() == Index->end()) { 
+    Stream.ExitBlock(); 
+    return; 
+  } 
+ 
+  for (const auto &GVI : valueIds()) { 
+    Stream.EmitRecord(bitc::FS_VALUE_GUID, 
+                      ArrayRef<uint64_t>{GVI.second, GVI.first}); 
+  } 
+ 
+  // Abbrev for FS_PERMODULE_PROFILE. 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_PROFILE)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // instcount 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // fflags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // numrefs 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // rorefcnt 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // worefcnt 
+  // numrefs x valueid, n x (valueid, hotness) 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for FS_PERMODULE or FS_PERMODULE_RELBF. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  if (WriteRelBFToSummary) 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_RELBF)); 
+  else 
+    Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // instcount 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // fflags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // numrefs 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // rorefcnt 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // worefcnt 
+  // numrefs x valueid, n x (valueid [, rel_block_freq]) 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for FS_PERMODULE_GLOBALVAR_INIT_REFS. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));  // valueids 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for FS_PERMODULE_VTABLE_GLOBALVAR_INIT_REFS. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE_VTABLE_GLOBALVAR_INIT_REFS)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // flags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // numrefs 
+  // numrefs x valueid, n x (valueid , offset) 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  unsigned FSModVTableRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for FS_ALIAS. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::FS_ALIAS)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid 
+  unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for FS_TYPE_ID_METADATA 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::FS_TYPE_ID_METADATA)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // typeid strtab index 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // typeid length 
+  // n x (valueid , offset) 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  unsigned TypeIdCompatibleVtableAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  SmallVector<uint64_t, 64> NameVals; 
+  // Iterate over the list of functions instead of the Index to 
+  // ensure the ordering is stable. 
+  for (const Function &F : M) { 
+    // Summary emission does not support anonymous functions, they have to 
+    // renamed using the anonymous function renaming pass. 
+    if (!F.hasName()) 
+      report_fatal_error("Unexpected anonymous function when writing summary"); 
+ 
+    ValueInfo VI = Index->getValueInfo(F.getGUID()); 
+    if (!VI || VI.getSummaryList().empty()) { 
+      // Only declarations should not have a summary (a declaration might 
+      // however have a summary if the def was in module level asm). 
+      assert(F.isDeclaration()); 
+      continue; 
+    } 
+    auto *Summary = VI.getSummaryList()[0].get(); 
+    writePerModuleFunctionSummaryRecord(NameVals, Summary, VE.getValueID(&F), 
+                                        FSCallsAbbrev, FSCallsProfileAbbrev, F); 
+  } 
+ 
+  // Capture references from GlobalVariable initializers, which are outside 
+  // of a function scope. 
+  for (const GlobalVariable &G : M.globals()) 
+    writeModuleLevelReferences(G, NameVals, FSModRefsAbbrev, 
+                               FSModVTableRefsAbbrev); 
+ 
+  for (const GlobalAlias &A : M.aliases()) { 
+    auto *Aliasee = A.getBaseObject(); 
+    if (!Aliasee->hasName()) 
+      // Nameless function don't have an entry in the summary, skip it. 
+      continue; 
+    auto AliasId = VE.getValueID(&A); 
+    auto AliaseeId = VE.getValueID(Aliasee); 
+    NameVals.push_back(AliasId); 
+    auto *Summary = Index->getGlobalValueSummary(A); 
+    AliasSummary *AS = cast<AliasSummary>(Summary); 
+    NameVals.push_back(getEncodedGVSummaryFlags(AS->flags())); 
+    NameVals.push_back(AliaseeId); 
+    Stream.EmitRecord(bitc::FS_ALIAS, NameVals, FSAliasAbbrev); 
+    NameVals.clear(); 
+  } 
+ 
+  for (auto &S : Index->typeIdCompatibleVtableMap()) { 
+    writeTypeIdCompatibleVtableSummaryRecord(NameVals, StrtabBuilder, S.first, 
+                                             S.second, VE); 
+    Stream.EmitRecord(bitc::FS_TYPE_ID_METADATA, NameVals, 
+                      TypeIdCompatibleVtableAbbrev); 
+    NameVals.clear(); 
+  } 
+ 
+  Stream.EmitRecord(bitc::FS_BLOCK_COUNT, 
+                    ArrayRef<uint64_t>{Index->getBlockCount()}); 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+/// Emit the combined summary section into the combined index file. 
+void IndexBitcodeWriter::writeCombinedGlobalValueSummary() { 
+  Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3); 
+  Stream.EmitRecord( 
+      bitc::FS_VERSION, 
+      ArrayRef<uint64_t>{ModuleSummaryIndex::BitcodeSummaryVersion}); 
+ 
+  // Write the index flags. 
+  Stream.EmitRecord(bitc::FS_FLAGS, ArrayRef<uint64_t>{Index.getFlags()}); 
+ 
+  for (const auto &GVI : valueIds()) { 
+    Stream.EmitRecord(bitc::FS_VALUE_GUID, 
+                      ArrayRef<uint64_t>{GVI.second, GVI.first}); 
+  } 
+ 
+  // Abbrev for FS_COMBINED. 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // modid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // instcount 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // fflags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // entrycount 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // numrefs 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // rorefcnt 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // worefcnt 
+  // numrefs x valueid, n x (valueid) 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  unsigned FSCallsAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for FS_COMBINED_PROFILE. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_PROFILE)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // modid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // instcount 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // fflags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // entrycount 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // numrefs 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // rorefcnt 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4));   // worefcnt 
+  // numrefs x valueid, n x (valueid, hotness) 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for FS_COMBINED_GLOBALVAR_INIT_REFS. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // modid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));    // valueids 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); 
+  unsigned FSModRefsAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // Abbrev for FS_COMBINED_ALIAS. 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::FS_COMBINED_ALIAS)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // modid 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // flags 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid 
+  unsigned FSAliasAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+  // The aliases are emitted as a post-pass, and will point to the value 
+  // id of the aliasee. Save them in a vector for post-processing. 
+  SmallVector<AliasSummary *, 64> Aliases; 
+ 
+  // Save the value id for each summary for alias emission. 
+  DenseMap<const GlobalValueSummary *, unsigned> SummaryToValueIdMap; 
+ 
+  SmallVector<uint64_t, 64> NameVals; 
+ 
+  // Set that will be populated during call to writeFunctionTypeMetadataRecords 
+  // with the type ids referenced by this index file. 
+  std::set<GlobalValue::GUID> ReferencedTypeIds; 
+ 
+  // For local linkage, we also emit the original name separately 
+  // immediately after the record. 
+  auto MaybeEmitOriginalName = [&](GlobalValueSummary &S) { 
+    if (!GlobalValue::isLocalLinkage(S.linkage())) 
+      return; 
+    NameVals.push_back(S.getOriginalName()); 
+    Stream.EmitRecord(bitc::FS_COMBINED_ORIGINAL_NAME, NameVals); 
+    NameVals.clear(); 
+  }; 
+ 
+  std::set<GlobalValue::GUID> DefOrUseGUIDs; 
+  forEachSummary([&](GVInfo I, bool IsAliasee) { 
+    GlobalValueSummary *S = I.second; 
+    assert(S); 
+    DefOrUseGUIDs.insert(I.first); 
+    for (const ValueInfo &VI : S->refs()) 
+      DefOrUseGUIDs.insert(VI.getGUID()); 
+ 
+    auto ValueId = getValueId(I.first); 
+    assert(ValueId); 
+    SummaryToValueIdMap[S] = *ValueId; 
+ 
+    // If this is invoked for an aliasee, we want to record the above 
+    // mapping, but then not emit a summary entry (if the aliasee is 
+    // to be imported, we will invoke this separately with IsAliasee=false). 
+    if (IsAliasee) 
+      return; 
+ 
+    if (auto *AS = dyn_cast<AliasSummary>(S)) { 
+      // Will process aliases as a post-pass because the reader wants all 
+      // global to be loaded first. 
+      Aliases.push_back(AS); 
+      return; 
+    } 
+ 
+    if (auto *VS = dyn_cast<GlobalVarSummary>(S)) { 
+      NameVals.push_back(*ValueId); 
+      NameVals.push_back(Index.getModuleId(VS->modulePath())); 
+      NameVals.push_back(getEncodedGVSummaryFlags(VS->flags())); 
+      NameVals.push_back(getEncodedGVarFlags(VS->varflags())); 
+      for (auto &RI : VS->refs()) { 
+        auto RefValueId = getValueId(RI.getGUID()); 
+        if (!RefValueId) 
+          continue; 
+        NameVals.push_back(*RefValueId); 
+      } 
+ 
+      // Emit the finished record. 
+      Stream.EmitRecord(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS, NameVals, 
+                        FSModRefsAbbrev); 
+      NameVals.clear(); 
+      MaybeEmitOriginalName(*S); 
+      return; 
+    } 
+ 
     auto GetValueId = [&](const ValueInfo &VI) -> Optional<unsigned> {
       GlobalValue::GUID GUID = VI.getGUID();
       Optional<unsigned> CallValueId = getValueId(GUID);
@@ -4178,758 +4178,758 @@ void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
       return CallValueId;
     };
 
-    auto *FS = cast<FunctionSummary>(S);
+    auto *FS = cast<FunctionSummary>(S); 
     writeFunctionTypeMetadataRecords(Stream, FS, GetValueId);
-    getReferencedTypeIds(FS, ReferencedTypeIds);
-
-    NameVals.push_back(*ValueId);
-    NameVals.push_back(Index.getModuleId(FS->modulePath()));
-    NameVals.push_back(getEncodedGVSummaryFlags(FS->flags()));
-    NameVals.push_back(FS->instCount());
-    NameVals.push_back(getEncodedFFlags(FS->fflags()));
-    NameVals.push_back(FS->entryCount());
-
-    // Fill in below
-    NameVals.push_back(0); // numrefs
-    NameVals.push_back(0); // rorefcnt
-    NameVals.push_back(0); // worefcnt
-
-    unsigned Count = 0, RORefCnt = 0, WORefCnt = 0;
-    for (auto &RI : FS->refs()) {
-      auto RefValueId = getValueId(RI.getGUID());
-      if (!RefValueId)
-        continue;
-      NameVals.push_back(*RefValueId);
-      if (RI.isReadOnly())
-        RORefCnt++;
-      else if (RI.isWriteOnly())
-        WORefCnt++;
-      Count++;
-    }
-    NameVals[6] = Count;
-    NameVals[7] = RORefCnt;
-    NameVals[8] = WORefCnt;
-
-    bool HasProfileData = false;
-    for (auto &EI : FS->calls()) {
-      HasProfileData |=
-          EI.second.getHotness() != CalleeInfo::HotnessType::Unknown;
-      if (HasProfileData)
-        break;
-    }
-
-    for (auto &EI : FS->calls()) {
-      // If this GUID doesn't have a value id, it doesn't have a function
-      // summary and we don't need to record any calls to it.
+    getReferencedTypeIds(FS, ReferencedTypeIds); 
+ 
+    NameVals.push_back(*ValueId); 
+    NameVals.push_back(Index.getModuleId(FS->modulePath())); 
+    NameVals.push_back(getEncodedGVSummaryFlags(FS->flags())); 
+    NameVals.push_back(FS->instCount()); 
+    NameVals.push_back(getEncodedFFlags(FS->fflags())); 
+    NameVals.push_back(FS->entryCount()); 
+ 
+    // Fill in below 
+    NameVals.push_back(0); // numrefs 
+    NameVals.push_back(0); // rorefcnt 
+    NameVals.push_back(0); // worefcnt 
+ 
+    unsigned Count = 0, RORefCnt = 0, WORefCnt = 0; 
+    for (auto &RI : FS->refs()) { 
+      auto RefValueId = getValueId(RI.getGUID()); 
+      if (!RefValueId) 
+        continue; 
+      NameVals.push_back(*RefValueId); 
+      if (RI.isReadOnly()) 
+        RORefCnt++; 
+      else if (RI.isWriteOnly()) 
+        WORefCnt++; 
+      Count++; 
+    } 
+    NameVals[6] = Count; 
+    NameVals[7] = RORefCnt; 
+    NameVals[8] = WORefCnt; 
+ 
+    bool HasProfileData = false; 
+    for (auto &EI : FS->calls()) { 
+      HasProfileData |= 
+          EI.second.getHotness() != CalleeInfo::HotnessType::Unknown; 
+      if (HasProfileData) 
+        break; 
+    } 
+ 
+    for (auto &EI : FS->calls()) { 
+      // If this GUID doesn't have a value id, it doesn't have a function 
+      // summary and we don't need to record any calls to it. 
       Optional<unsigned> CallValueId = GetValueId(EI.first);
       if (!CallValueId)
         continue;
-      NameVals.push_back(*CallValueId);
-      if (HasProfileData)
-        NameVals.push_back(static_cast<uint8_t>(EI.second.Hotness));
-    }
-
-    unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev);
-    unsigned Code =
-        (HasProfileData ? bitc::FS_COMBINED_PROFILE : bitc::FS_COMBINED);
-
-    // Emit the finished record.
-    Stream.EmitRecord(Code, NameVals, FSAbbrev);
-    NameVals.clear();
-    MaybeEmitOriginalName(*S);
-  });
-
-  for (auto *AS : Aliases) {
-    auto AliasValueId = SummaryToValueIdMap[AS];
-    assert(AliasValueId);
-    NameVals.push_back(AliasValueId);
-    NameVals.push_back(Index.getModuleId(AS->modulePath()));
-    NameVals.push_back(getEncodedGVSummaryFlags(AS->flags()));
-    auto AliaseeValueId = SummaryToValueIdMap[&AS->getAliasee()];
-    assert(AliaseeValueId);
-    NameVals.push_back(AliaseeValueId);
-
-    // Emit the finished record.
-    Stream.EmitRecord(bitc::FS_COMBINED_ALIAS, NameVals, FSAliasAbbrev);
-    NameVals.clear();
-    MaybeEmitOriginalName(*AS);
-
-    if (auto *FS = dyn_cast<FunctionSummary>(&AS->getAliasee()))
-      getReferencedTypeIds(FS, ReferencedTypeIds);
-  }
-
-  if (!Index.cfiFunctionDefs().empty()) {
-    for (auto &S : Index.cfiFunctionDefs()) {
-      if (DefOrUseGUIDs.count(
-              GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(S)))) {
-        NameVals.push_back(StrtabBuilder.add(S));
-        NameVals.push_back(S.size());
-      }
-    }
-    if (!NameVals.empty()) {
-      Stream.EmitRecord(bitc::FS_CFI_FUNCTION_DEFS, NameVals);
-      NameVals.clear();
-    }
-  }
-
-  if (!Index.cfiFunctionDecls().empty()) {
-    for (auto &S : Index.cfiFunctionDecls()) {
-      if (DefOrUseGUIDs.count(
-              GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(S)))) {
-        NameVals.push_back(StrtabBuilder.add(S));
-        NameVals.push_back(S.size());
-      }
-    }
-    if (!NameVals.empty()) {
-      Stream.EmitRecord(bitc::FS_CFI_FUNCTION_DECLS, NameVals);
-      NameVals.clear();
-    }
-  }
-
-  // Walk the GUIDs that were referenced, and write the
-  // corresponding type id records.
-  for (auto &T : ReferencedTypeIds) {
-    auto TidIter = Index.typeIds().equal_range(T);
-    for (auto It = TidIter.first; It != TidIter.second; ++It) {
-      writeTypeIdSummaryRecord(NameVals, StrtabBuilder, It->second.first,
-                               It->second.second);
-      Stream.EmitRecord(bitc::FS_TYPE_ID, NameVals);
-      NameVals.clear();
-    }
-  }
-
-  Stream.EmitRecord(bitc::FS_BLOCK_COUNT,
-                    ArrayRef<uint64_t>{Index.getBlockCount()});
-
-  Stream.ExitBlock();
-}
-
-/// Create the "IDENTIFICATION_BLOCK_ID" containing a single string with the
-/// current llvm version, and a record for the epoch number.
-static void writeIdentificationBlock(BitstreamWriter &Stream) {
-  Stream.EnterSubblock(bitc::IDENTIFICATION_BLOCK_ID, 5);
-
-  // Write the "user readable" string identifying the bitcode producer
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_STRING));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-  auto StringAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-  writeStringRecord(Stream, bitc::IDENTIFICATION_CODE_STRING,
-                    "LLVM" LLVM_VERSION_STRING, StringAbbrev);
-
-  // Write the epoch version
-  Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_EPOCH));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  auto EpochAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-  constexpr std::array<unsigned, 1> Vals = {{bitc::BITCODE_CURRENT_EPOCH}};
-  Stream.EmitRecord(bitc::IDENTIFICATION_CODE_EPOCH, Vals, EpochAbbrev);
-  Stream.ExitBlock();
-}
-
-void ModuleBitcodeWriter::writeModuleHash(size_t BlockStartPos) {
-  // Emit the module's hash.
-  // MODULE_CODE_HASH: [5*i32]
-  if (GenerateHash) {
-    uint32_t Vals[5];
-    Hasher.update(ArrayRef<uint8_t>((const uint8_t *)&(Buffer)[BlockStartPos],
-                                    Buffer.size() - BlockStartPos));
-    StringRef Hash = Hasher.result();
-    for (int Pos = 0; Pos < 20; Pos += 4) {
-      Vals[Pos / 4] = support::endian::read32be(Hash.data() + Pos);
-    }
-
-    // Emit the finished record.
-    Stream.EmitRecord(bitc::MODULE_CODE_HASH, Vals);
-
-    if (ModHash)
-      // Save the written hash value.
-      llvm::copy(Vals, std::begin(*ModHash));
-  }
-}
-
-void ModuleBitcodeWriter::write() {
-  writeIdentificationBlock(Stream);
-
-  Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
-  size_t BlockStartPos = Buffer.size();
-
-  writeModuleVersion();
-
-  // Emit blockinfo, which defines the standard abbreviations etc.
-  writeBlockInfo();
-
-  // Emit information describing all of the types in the module.
-  writeTypeTable();
-
-  // Emit information about attribute groups.
-  writeAttributeGroupTable();
-
-  // Emit information about parameter attributes.
-  writeAttributeTable();
-
-  writeComdats();
-
-  // Emit top-level description of module, including target triple, inline asm,
-  // descriptors for global variables, and function prototype info.
-  writeModuleInfo();
-
-  // Emit constants.
-  writeModuleConstants();
-
-  // Emit metadata kind names.
-  writeModuleMetadataKinds();
-
-  // Emit metadata.
-  writeModuleMetadata();
-
-  // Emit module-level use-lists.
-  if (VE.shouldPreserveUseListOrder())
-    writeUseListBlock(nullptr);
-
-  writeOperandBundleTags();
-  writeSyncScopeNames();
-
-  // Emit function bodies.
-  DenseMap<const Function *, uint64_t> FunctionToBitcodeIndex;
-  for (Module::const_iterator F = M.begin(), E = M.end(); F != E; ++F)
-    if (!F->isDeclaration())
-      writeFunction(*F, FunctionToBitcodeIndex);
-
-  // Need to write after the above call to WriteFunction which populates
-  // the summary information in the index.
-  if (Index)
-    writePerModuleGlobalValueSummary();
-
-  writeGlobalValueSymbolTable(FunctionToBitcodeIndex);
-
-  writeModuleHash(BlockStartPos);
-
-  Stream.ExitBlock();
-}
-
-static void writeInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer,
-                               uint32_t &Position) {
-  support::endian::write32le(&Buffer[Position], Value);
-  Position += 4;
-}
-
-/// If generating a bc file on darwin, we have to emit a
-/// header and trailer to make it compatible with the system archiver.  To do
-/// this we emit the following header, and then emit a trailer that pads the
-/// file out to be a multiple of 16 bytes.
-///
-/// struct bc_header {
-///   uint32_t Magic;         // 0x0B17C0DE
-///   uint32_t Version;       // Version, currently always 0.
-///   uint32_t BitcodeOffset; // Offset to traditional bitcode file.
-///   uint32_t BitcodeSize;   // Size of traditional bitcode file.
-///   uint32_t CPUType;       // CPU specifier.
-///   ... potentially more later ...
-/// };
-static void emitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer,
-                                         const Triple &TT) {
-  unsigned CPUType = ~0U;
-
-  // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
-  // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic
-  // number from /usr/include/mach/machine.h.  It is ok to reproduce the
-  // specific constants here because they are implicitly part of the Darwin ABI.
-  enum {
-    DARWIN_CPU_ARCH_ABI64      = 0x01000000,
-    DARWIN_CPU_TYPE_X86        = 7,
-    DARWIN_CPU_TYPE_ARM        = 12,
-    DARWIN_CPU_TYPE_POWERPC    = 18
-  };
-
-  Triple::ArchType Arch = TT.getArch();
-  if (Arch == Triple::x86_64)
-    CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64;
-  else if (Arch == Triple::x86)
-    CPUType = DARWIN_CPU_TYPE_X86;
-  else if (Arch == Triple::ppc)
-    CPUType = DARWIN_CPU_TYPE_POWERPC;
-  else if (Arch == Triple::ppc64)
-    CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
-  else if (Arch == Triple::arm || Arch == Triple::thumb)
-    CPUType = DARWIN_CPU_TYPE_ARM;
-
-  // Traditional Bitcode starts after header.
-  assert(Buffer.size() >= BWH_HeaderSize &&
-         "Expected header size to be reserved");
-  unsigned BCOffset = BWH_HeaderSize;
-  unsigned BCSize = Buffer.size() - BWH_HeaderSize;
-
-  // Write the magic and version.
-  unsigned Position = 0;
-  writeInt32ToBuffer(0x0B17C0DE, Buffer, Position);
-  writeInt32ToBuffer(0, Buffer, Position); // Version.
-  writeInt32ToBuffer(BCOffset, Buffer, Position);
-  writeInt32ToBuffer(BCSize, Buffer, Position);
-  writeInt32ToBuffer(CPUType, Buffer, Position);
-
-  // If the file is not a multiple of 16 bytes, insert dummy padding.
-  while (Buffer.size() & 15)
-    Buffer.push_back(0);
-}
-
-/// Helper to write the header common to all bitcode files.
-static void writeBitcodeHeader(BitstreamWriter &Stream) {
-  // Emit the file header.
-  Stream.Emit((unsigned)'B', 8);
-  Stream.Emit((unsigned)'C', 8);
-  Stream.Emit(0x0, 4);
-  Stream.Emit(0xC, 4);
-  Stream.Emit(0xE, 4);
-  Stream.Emit(0xD, 4);
-}
-
+      NameVals.push_back(*CallValueId); 
+      if (HasProfileData) 
+        NameVals.push_back(static_cast<uint8_t>(EI.second.Hotness)); 
+    } 
+ 
+    unsigned FSAbbrev = (HasProfileData ? FSCallsProfileAbbrev : FSCallsAbbrev); 
+    unsigned Code = 
+        (HasProfileData ? bitc::FS_COMBINED_PROFILE : bitc::FS_COMBINED); 
+ 
+    // Emit the finished record. 
+    Stream.EmitRecord(Code, NameVals, FSAbbrev); 
+    NameVals.clear(); 
+    MaybeEmitOriginalName(*S); 
+  }); 
+ 
+  for (auto *AS : Aliases) { 
+    auto AliasValueId = SummaryToValueIdMap[AS]; 
+    assert(AliasValueId); 
+    NameVals.push_back(AliasValueId); 
+    NameVals.push_back(Index.getModuleId(AS->modulePath())); 
+    NameVals.push_back(getEncodedGVSummaryFlags(AS->flags())); 
+    auto AliaseeValueId = SummaryToValueIdMap[&AS->getAliasee()]; 
+    assert(AliaseeValueId); 
+    NameVals.push_back(AliaseeValueId); 
+ 
+    // Emit the finished record. 
+    Stream.EmitRecord(bitc::FS_COMBINED_ALIAS, NameVals, FSAliasAbbrev); 
+    NameVals.clear(); 
+    MaybeEmitOriginalName(*AS); 
+ 
+    if (auto *FS = dyn_cast<FunctionSummary>(&AS->getAliasee())) 
+      getReferencedTypeIds(FS, ReferencedTypeIds); 
+  } 
+ 
+  if (!Index.cfiFunctionDefs().empty()) { 
+    for (auto &S : Index.cfiFunctionDefs()) { 
+      if (DefOrUseGUIDs.count( 
+              GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(S)))) { 
+        NameVals.push_back(StrtabBuilder.add(S)); 
+        NameVals.push_back(S.size()); 
+      } 
+    } 
+    if (!NameVals.empty()) { 
+      Stream.EmitRecord(bitc::FS_CFI_FUNCTION_DEFS, NameVals); 
+      NameVals.clear(); 
+    } 
+  } 
+ 
+  if (!Index.cfiFunctionDecls().empty()) { 
+    for (auto &S : Index.cfiFunctionDecls()) { 
+      if (DefOrUseGUIDs.count( 
+              GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(S)))) { 
+        NameVals.push_back(StrtabBuilder.add(S)); 
+        NameVals.push_back(S.size()); 
+      } 
+    } 
+    if (!NameVals.empty()) { 
+      Stream.EmitRecord(bitc::FS_CFI_FUNCTION_DECLS, NameVals); 
+      NameVals.clear(); 
+    } 
+  } 
+ 
+  // Walk the GUIDs that were referenced, and write the 
+  // corresponding type id records. 
+  for (auto &T : ReferencedTypeIds) { 
+    auto TidIter = Index.typeIds().equal_range(T); 
+    for (auto It = TidIter.first; It != TidIter.second; ++It) { 
+      writeTypeIdSummaryRecord(NameVals, StrtabBuilder, It->second.first, 
+                               It->second.second); 
+      Stream.EmitRecord(bitc::FS_TYPE_ID, NameVals); 
+      NameVals.clear(); 
+    } 
+  } 
+ 
+  Stream.EmitRecord(bitc::FS_BLOCK_COUNT, 
+                    ArrayRef<uint64_t>{Index.getBlockCount()}); 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+/// Create the "IDENTIFICATION_BLOCK_ID" containing a single string with the 
+/// current llvm version, and a record for the epoch number. 
+static void writeIdentificationBlock(BitstreamWriter &Stream) { 
+  Stream.EnterSubblock(bitc::IDENTIFICATION_BLOCK_ID, 5); 
+ 
+  // Write the "user readable" string identifying the bitcode producer 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_STRING)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6)); 
+  auto StringAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+  writeStringRecord(Stream, bitc::IDENTIFICATION_CODE_STRING, 
+                    "LLVM" LLVM_VERSION_STRING, StringAbbrev); 
+ 
+  // Write the epoch version 
+  Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_EPOCH)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); 
+  auto EpochAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+  constexpr std::array<unsigned, 1> Vals = {{bitc::BITCODE_CURRENT_EPOCH}}; 
+  Stream.EmitRecord(bitc::IDENTIFICATION_CODE_EPOCH, Vals, EpochAbbrev); 
+  Stream.ExitBlock(); 
+} 
+ 
+void ModuleBitcodeWriter::writeModuleHash(size_t BlockStartPos) { 
+  // Emit the module's hash. 
+  // MODULE_CODE_HASH: [5*i32] 
+  if (GenerateHash) { 
+    uint32_t Vals[5]; 
+    Hasher.update(ArrayRef<uint8_t>((const uint8_t *)&(Buffer)[BlockStartPos], 
+                                    Buffer.size() - BlockStartPos)); 
+    StringRef Hash = Hasher.result(); 
+    for (int Pos = 0; Pos < 20; Pos += 4) { 
+      Vals[Pos / 4] = support::endian::read32be(Hash.data() + Pos); 
+    } 
+ 
+    // Emit the finished record. 
+    Stream.EmitRecord(bitc::MODULE_CODE_HASH, Vals); 
+ 
+    if (ModHash) 
+      // Save the written hash value. 
+      llvm::copy(Vals, std::begin(*ModHash)); 
+  } 
+} 
+ 
+void ModuleBitcodeWriter::write() { 
+  writeIdentificationBlock(Stream); 
+ 
+  Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 
+  size_t BlockStartPos = Buffer.size(); 
+ 
+  writeModuleVersion(); 
+ 
+  // Emit blockinfo, which defines the standard abbreviations etc. 
+  writeBlockInfo(); 
+ 
+  // Emit information describing all of the types in the module. 
+  writeTypeTable(); 
+ 
+  // Emit information about attribute groups. 
+  writeAttributeGroupTable(); 
+ 
+  // Emit information about parameter attributes. 
+  writeAttributeTable(); 
+ 
+  writeComdats(); 
+ 
+  // Emit top-level description of module, including target triple, inline asm, 
+  // descriptors for global variables, and function prototype info. 
+  writeModuleInfo(); 
+ 
+  // Emit constants. 
+  writeModuleConstants(); 
+ 
+  // Emit metadata kind names. 
+  writeModuleMetadataKinds(); 
+ 
+  // Emit metadata. 
+  writeModuleMetadata(); 
+ 
+  // Emit module-level use-lists. 
+  if (VE.shouldPreserveUseListOrder()) 
+    writeUseListBlock(nullptr); 
+ 
+  writeOperandBundleTags(); 
+  writeSyncScopeNames(); 
+ 
+  // Emit function bodies. 
+  DenseMap<const Function *, uint64_t> FunctionToBitcodeIndex; 
+  for (Module::const_iterator F = M.begin(), E = M.end(); F != E; ++F) 
+    if (!F->isDeclaration()) 
+      writeFunction(*F, FunctionToBitcodeIndex); 
+ 
+  // Need to write after the above call to WriteFunction which populates 
+  // the summary information in the index. 
+  if (Index) 
+    writePerModuleGlobalValueSummary(); 
+ 
+  writeGlobalValueSymbolTable(FunctionToBitcodeIndex); 
+ 
+  writeModuleHash(BlockStartPos); 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+static void writeInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer, 
+                               uint32_t &Position) { 
+  support::endian::write32le(&Buffer[Position], Value); 
+  Position += 4; 
+} 
+ 
+/// If generating a bc file on darwin, we have to emit a 
+/// header and trailer to make it compatible with the system archiver.  To do 
+/// this we emit the following header, and then emit a trailer that pads the 
+/// file out to be a multiple of 16 bytes. 
+/// 
+/// struct bc_header { 
+///   uint32_t Magic;         // 0x0B17C0DE 
+///   uint32_t Version;       // Version, currently always 0. 
+///   uint32_t BitcodeOffset; // Offset to traditional bitcode file. 
+///   uint32_t BitcodeSize;   // Size of traditional bitcode file. 
+///   uint32_t CPUType;       // CPU specifier. 
+///   ... potentially more later ... 
+/// }; 
+static void emitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer, 
+                                         const Triple &TT) { 
+  unsigned CPUType = ~0U; 
+ 
+  // Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*, 
+  // armv[0-9]-*, thumbv[0-9]-*, armv5te-*, or armv6t2-*. The CPUType is a magic 
+  // number from /usr/include/mach/machine.h.  It is ok to reproduce the 
+  // specific constants here because they are implicitly part of the Darwin ABI. 
+  enum { 
+    DARWIN_CPU_ARCH_ABI64      = 0x01000000, 
+    DARWIN_CPU_TYPE_X86        = 7, 
+    DARWIN_CPU_TYPE_ARM        = 12, 
+    DARWIN_CPU_TYPE_POWERPC    = 18 
+  }; 
+ 
+  Triple::ArchType Arch = TT.getArch(); 
+  if (Arch == Triple::x86_64) 
+    CPUType = DARWIN_CPU_TYPE_X86 | DARWIN_CPU_ARCH_ABI64; 
+  else if (Arch == Triple::x86) 
+    CPUType = DARWIN_CPU_TYPE_X86; 
+  else if (Arch == Triple::ppc) 
+    CPUType = DARWIN_CPU_TYPE_POWERPC; 
+  else if (Arch == Triple::ppc64) 
+    CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64; 
+  else if (Arch == Triple::arm || Arch == Triple::thumb) 
+    CPUType = DARWIN_CPU_TYPE_ARM; 
+ 
+  // Traditional Bitcode starts after header. 
+  assert(Buffer.size() >= BWH_HeaderSize && 
+         "Expected header size to be reserved"); 
+  unsigned BCOffset = BWH_HeaderSize; 
+  unsigned BCSize = Buffer.size() - BWH_HeaderSize; 
+ 
+  // Write the magic and version. 
+  unsigned Position = 0; 
+  writeInt32ToBuffer(0x0B17C0DE, Buffer, Position); 
+  writeInt32ToBuffer(0, Buffer, Position); // Version. 
+  writeInt32ToBuffer(BCOffset, Buffer, Position); 
+  writeInt32ToBuffer(BCSize, Buffer, Position); 
+  writeInt32ToBuffer(CPUType, Buffer, Position); 
+ 
+  // If the file is not a multiple of 16 bytes, insert dummy padding. 
+  while (Buffer.size() & 15) 
+    Buffer.push_back(0); 
+} 
+ 
+/// Helper to write the header common to all bitcode files. 
+static void writeBitcodeHeader(BitstreamWriter &Stream) { 
+  // Emit the file header. 
+  Stream.Emit((unsigned)'B', 8); 
+  Stream.Emit((unsigned)'C', 8); 
+  Stream.Emit(0x0, 4); 
+  Stream.Emit(0xC, 4); 
+  Stream.Emit(0xE, 4); 
+  Stream.Emit(0xD, 4); 
+} 
+ 
 BitcodeWriter::BitcodeWriter(SmallVectorImpl<char> &Buffer, raw_fd_stream *FS)
     : Buffer(Buffer), Stream(new BitstreamWriter(Buffer, FS, FlushThreshold)) {
-  writeBitcodeHeader(*Stream);
-}
-
-BitcodeWriter::~BitcodeWriter() { assert(WroteStrtab); }
-
-void BitcodeWriter::writeBlob(unsigned Block, unsigned Record, StringRef Blob) {
-  Stream->EnterSubblock(Block, 3);
-
-  auto Abbv = std::make_shared<BitCodeAbbrev>();
-  Abbv->Add(BitCodeAbbrevOp(Record));
-  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
-  auto AbbrevNo = Stream->EmitAbbrev(std::move(Abbv));
-
-  Stream->EmitRecordWithBlob(AbbrevNo, ArrayRef<uint64_t>{Record}, Blob);
-
-  Stream->ExitBlock();
-}
-
-void BitcodeWriter::writeSymtab() {
-  assert(!WroteStrtab && !WroteSymtab);
-
-  // If any module has module-level inline asm, we will require a registered asm
-  // parser for the target so that we can create an accurate symbol table for
-  // the module.
-  for (Module *M : Mods) {
-    if (M->getModuleInlineAsm().empty())
-      continue;
-
-    std::string Err;
-    const Triple TT(M->getTargetTriple());
-    const Target *T = TargetRegistry::lookupTarget(TT.str(), Err);
-    if (!T || !T->hasMCAsmParser())
-      return;
-  }
-
-  WroteSymtab = true;
-  SmallVector<char, 0> Symtab;
-  // The irsymtab::build function may be unable to create a symbol table if the
-  // module is malformed (e.g. it contains an invalid alias). Writing a symbol
-  // table is not required for correctness, but we still want to be able to
-  // write malformed modules to bitcode files, so swallow the error.
-  if (Error E = irsymtab::build(Mods, Symtab, StrtabBuilder, Alloc)) {
-    consumeError(std::move(E));
-    return;
-  }
-
-  writeBlob(bitc::SYMTAB_BLOCK_ID, bitc::SYMTAB_BLOB,
-            {Symtab.data(), Symtab.size()});
-}
-
-void BitcodeWriter::writeStrtab() {
-  assert(!WroteStrtab);
-
-  std::vector<char> Strtab;
-  StrtabBuilder.finalizeInOrder();
-  Strtab.resize(StrtabBuilder.getSize());
-  StrtabBuilder.write((uint8_t *)Strtab.data());
-
-  writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB,
-            {Strtab.data(), Strtab.size()});
-
-  WroteStrtab = true;
-}
-
-void BitcodeWriter::copyStrtab(StringRef Strtab) {
-  writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB, Strtab);
-  WroteStrtab = true;
-}
-
-void BitcodeWriter::writeModule(const Module &M,
-                                bool ShouldPreserveUseListOrder,
-                                const ModuleSummaryIndex *Index,
-                                bool GenerateHash, ModuleHash *ModHash) {
-  assert(!WroteStrtab);
-
-  // The Mods vector is used by irsymtab::build, which requires non-const
-  // Modules in case it needs to materialize metadata. But the bitcode writer
-  // requires that the module is materialized, so we can cast to non-const here,
-  // after checking that it is in fact materialized.
-  assert(M.isMaterialized());
-  Mods.push_back(const_cast<Module *>(&M));
-
-  ModuleBitcodeWriter ModuleWriter(M, Buffer, StrtabBuilder, *Stream,
-                                   ShouldPreserveUseListOrder, Index,
-                                   GenerateHash, ModHash);
-  ModuleWriter.write();
-}
-
-void BitcodeWriter::writeIndex(
-    const ModuleSummaryIndex *Index,
-    const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex) {
-  IndexBitcodeWriter IndexWriter(*Stream, StrtabBuilder, *Index,
-                                 ModuleToSummariesForIndex);
-  IndexWriter.write();
-}
-
-/// Write the specified module to the specified output stream.
-void llvm::WriteBitcodeToFile(const Module &M, raw_ostream &Out,
-                              bool ShouldPreserveUseListOrder,
-                              const ModuleSummaryIndex *Index,
-                              bool GenerateHash, ModuleHash *ModHash) {
-  SmallVector<char, 0> Buffer;
-  Buffer.reserve(256*1024);
-
-  // If this is darwin or another generic macho target, reserve space for the
-  // header.
-  Triple TT(M.getTargetTriple());
-  if (TT.isOSDarwin() || TT.isOSBinFormatMachO())
-    Buffer.insert(Buffer.begin(), BWH_HeaderSize, 0);
-
+  writeBitcodeHeader(*Stream); 
+} 
+ 
+BitcodeWriter::~BitcodeWriter() { assert(WroteStrtab); } 
+ 
+void BitcodeWriter::writeBlob(unsigned Block, unsigned Record, StringRef Blob) { 
+  Stream->EnterSubblock(Block, 3); 
+ 
+  auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+  Abbv->Add(BitCodeAbbrevOp(Record)); 
+  Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); 
+  auto AbbrevNo = Stream->EmitAbbrev(std::move(Abbv)); 
+ 
+  Stream->EmitRecordWithBlob(AbbrevNo, ArrayRef<uint64_t>{Record}, Blob); 
+ 
+  Stream->ExitBlock(); 
+} 
+ 
+void BitcodeWriter::writeSymtab() { 
+  assert(!WroteStrtab && !WroteSymtab); 
+ 
+  // If any module has module-level inline asm, we will require a registered asm 
+  // parser for the target so that we can create an accurate symbol table for 
+  // the module. 
+  for (Module *M : Mods) { 
+    if (M->getModuleInlineAsm().empty()) 
+      continue; 
+ 
+    std::string Err; 
+    const Triple TT(M->getTargetTriple()); 
+    const Target *T = TargetRegistry::lookupTarget(TT.str(), Err); 
+    if (!T || !T->hasMCAsmParser()) 
+      return; 
+  } 
+ 
+  WroteSymtab = true; 
+  SmallVector<char, 0> Symtab; 
+  // The irsymtab::build function may be unable to create a symbol table if the 
+  // module is malformed (e.g. it contains an invalid alias). Writing a symbol 
+  // table is not required for correctness, but we still want to be able to 
+  // write malformed modules to bitcode files, so swallow the error. 
+  if (Error E = irsymtab::build(Mods, Symtab, StrtabBuilder, Alloc)) { 
+    consumeError(std::move(E)); 
+    return; 
+  } 
+ 
+  writeBlob(bitc::SYMTAB_BLOCK_ID, bitc::SYMTAB_BLOB, 
+            {Symtab.data(), Symtab.size()}); 
+} 
+ 
+void BitcodeWriter::writeStrtab() { 
+  assert(!WroteStrtab); 
+ 
+  std::vector<char> Strtab; 
+  StrtabBuilder.finalizeInOrder(); 
+  Strtab.resize(StrtabBuilder.getSize()); 
+  StrtabBuilder.write((uint8_t *)Strtab.data()); 
+ 
+  writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB, 
+            {Strtab.data(), Strtab.size()}); 
+ 
+  WroteStrtab = true; 
+} 
+ 
+void BitcodeWriter::copyStrtab(StringRef Strtab) { 
+  writeBlob(bitc::STRTAB_BLOCK_ID, bitc::STRTAB_BLOB, Strtab); 
+  WroteStrtab = true; 
+} 
+ 
+void BitcodeWriter::writeModule(const Module &M, 
+                                bool ShouldPreserveUseListOrder, 
+                                const ModuleSummaryIndex *Index, 
+                                bool GenerateHash, ModuleHash *ModHash) { 
+  assert(!WroteStrtab); 
+ 
+  // The Mods vector is used by irsymtab::build, which requires non-const 
+  // Modules in case it needs to materialize metadata. But the bitcode writer 
+  // requires that the module is materialized, so we can cast to non-const here, 
+  // after checking that it is in fact materialized. 
+  assert(M.isMaterialized()); 
+  Mods.push_back(const_cast<Module *>(&M)); 
+ 
+  ModuleBitcodeWriter ModuleWriter(M, Buffer, StrtabBuilder, *Stream, 
+                                   ShouldPreserveUseListOrder, Index, 
+                                   GenerateHash, ModHash); 
+  ModuleWriter.write(); 
+} 
+ 
+void BitcodeWriter::writeIndex( 
+    const ModuleSummaryIndex *Index, 
+    const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex) { 
+  IndexBitcodeWriter IndexWriter(*Stream, StrtabBuilder, *Index, 
+                                 ModuleToSummariesForIndex); 
+  IndexWriter.write(); 
+} 
+ 
+/// Write the specified module to the specified output stream. 
+void llvm::WriteBitcodeToFile(const Module &M, raw_ostream &Out, 
+                              bool ShouldPreserveUseListOrder, 
+                              const ModuleSummaryIndex *Index, 
+                              bool GenerateHash, ModuleHash *ModHash) { 
+  SmallVector<char, 0> Buffer; 
+  Buffer.reserve(256*1024); 
+ 
+  // If this is darwin or another generic macho target, reserve space for the 
+  // header. 
+  Triple TT(M.getTargetTriple()); 
+  if (TT.isOSDarwin() || TT.isOSBinFormatMachO()) 
+    Buffer.insert(Buffer.begin(), BWH_HeaderSize, 0); 
+ 
   BitcodeWriter Writer(Buffer, dyn_cast<raw_fd_stream>(&Out));
-  Writer.writeModule(M, ShouldPreserveUseListOrder, Index, GenerateHash,
-                     ModHash);
-  Writer.writeSymtab();
-  Writer.writeStrtab();
-
-  if (TT.isOSDarwin() || TT.isOSBinFormatMachO())
-    emitDarwinBCHeaderAndTrailer(Buffer, TT);
-
-  // Write the generated bitstream to "Out".
+  Writer.writeModule(M, ShouldPreserveUseListOrder, Index, GenerateHash, 
+                     ModHash); 
+  Writer.writeSymtab(); 
+  Writer.writeStrtab(); 
+ 
+  if (TT.isOSDarwin() || TT.isOSBinFormatMachO()) 
+    emitDarwinBCHeaderAndTrailer(Buffer, TT); 
+ 
+  // Write the generated bitstream to "Out". 
   if (!Buffer.empty())
     Out.write((char *)&Buffer.front(), Buffer.size());
-}
-
-void IndexBitcodeWriter::write() {
-  Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
-
-  writeModuleVersion();
-
-  // Write the module paths in the combined index.
-  writeModStrings();
-
-  // Write the summary combined index records.
-  writeCombinedGlobalValueSummary();
-
-  Stream.ExitBlock();
-}
-
-// Write the specified module summary index to the given raw output stream,
-// where it will be written in a new bitcode block. This is used when
-// writing the combined index file for ThinLTO. When writing a subset of the
-// index for a distributed backend, provide a \p ModuleToSummariesForIndex map.
-void llvm::WriteIndexToFile(
-    const ModuleSummaryIndex &Index, raw_ostream &Out,
-    const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex) {
-  SmallVector<char, 0> Buffer;
-  Buffer.reserve(256 * 1024);
-
-  BitcodeWriter Writer(Buffer);
-  Writer.writeIndex(&Index, ModuleToSummariesForIndex);
-  Writer.writeStrtab();
-
-  Out.write((char *)&Buffer.front(), Buffer.size());
-}
-
-namespace {
-
-/// Class to manage the bitcode writing for a thin link bitcode file.
-class ThinLinkBitcodeWriter : public ModuleBitcodeWriterBase {
-  /// ModHash is for use in ThinLTO incremental build, generated while writing
-  /// the module bitcode file.
-  const ModuleHash *ModHash;
-
-public:
-  ThinLinkBitcodeWriter(const Module &M, StringTableBuilder &StrtabBuilder,
-                        BitstreamWriter &Stream,
-                        const ModuleSummaryIndex &Index,
-                        const ModuleHash &ModHash)
-      : ModuleBitcodeWriterBase(M, StrtabBuilder, Stream,
-                                /*ShouldPreserveUseListOrder=*/false, &Index),
-        ModHash(&ModHash) {}
-
-  void write();
-
-private:
-  void writeSimplifiedModuleInfo();
-};
-
-} // end anonymous namespace
-
-// This function writes a simpilified module info for thin link bitcode file.
-// It only contains the source file name along with the name(the offset and
-// size in strtab) and linkage for global values. For the global value info
-// entry, in order to keep linkage at offset 5, there are three zeros used
-// as padding.
-void ThinLinkBitcodeWriter::writeSimplifiedModuleInfo() {
-  SmallVector<unsigned, 64> Vals;
-  // Emit the module's source file name.
-  {
-    StringEncoding Bits = getStringEncoding(M.getSourceFileName());
-    BitCodeAbbrevOp AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8);
-    if (Bits == SE_Char6)
-      AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Char6);
-    else if (Bits == SE_Fixed7)
-      AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7);
-
-    // MODULE_CODE_SOURCE_FILENAME: [namechar x N]
-    auto Abbv = std::make_shared<BitCodeAbbrev>();
-    Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_SOURCE_FILENAME));
-    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
-    Abbv->Add(AbbrevOpToUse);
-    unsigned FilenameAbbrev = Stream.EmitAbbrev(std::move(Abbv));
-
-    for (const auto P : M.getSourceFileName())
-      Vals.push_back((unsigned char)P);
-
-    Stream.EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals, FilenameAbbrev);
-    Vals.clear();
-  }
-
-  // Emit the global variable information.
-  for (const GlobalVariable &GV : M.globals()) {
-    // GLOBALVAR: [strtab offset, strtab size, 0, 0, 0, linkage]
-    Vals.push_back(StrtabBuilder.add(GV.getName()));
-    Vals.push_back(GV.getName().size());
-    Vals.push_back(0);
-    Vals.push_back(0);
-    Vals.push_back(0);
-    Vals.push_back(getEncodedLinkage(GV));
-
-    Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals);
-    Vals.clear();
-  }
-
-  // Emit the function proto information.
-  for (const Function &F : M) {
-    // FUNCTION:  [strtab offset, strtab size, 0, 0, 0, linkage]
-    Vals.push_back(StrtabBuilder.add(F.getName()));
-    Vals.push_back(F.getName().size());
-    Vals.push_back(0);
-    Vals.push_back(0);
-    Vals.push_back(0);
-    Vals.push_back(getEncodedLinkage(F));
-
-    Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals);
-    Vals.clear();
-  }
-
-  // Emit the alias information.
-  for (const GlobalAlias &A : M.aliases()) {
-    // ALIAS: [strtab offset, strtab size, 0, 0, 0, linkage]
-    Vals.push_back(StrtabBuilder.add(A.getName()));
-    Vals.push_back(A.getName().size());
-    Vals.push_back(0);
-    Vals.push_back(0);
-    Vals.push_back(0);
-    Vals.push_back(getEncodedLinkage(A));
-
-    Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals);
-    Vals.clear();
-  }
-
-  // Emit the ifunc information.
-  for (const GlobalIFunc &I : M.ifuncs()) {
-    // IFUNC: [strtab offset, strtab size, 0, 0, 0, linkage]
-    Vals.push_back(StrtabBuilder.add(I.getName()));
-    Vals.push_back(I.getName().size());
-    Vals.push_back(0);
-    Vals.push_back(0);
-    Vals.push_back(0);
-    Vals.push_back(getEncodedLinkage(I));
-
-    Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals);
-    Vals.clear();
-  }
-}
-
-void ThinLinkBitcodeWriter::write() {
-  Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
-
-  writeModuleVersion();
-
-  writeSimplifiedModuleInfo();
-
-  writePerModuleGlobalValueSummary();
-
-  // Write module hash.
-  Stream.EmitRecord(bitc::MODULE_CODE_HASH, ArrayRef<uint32_t>(*ModHash));
-
-  Stream.ExitBlock();
-}
-
-void BitcodeWriter::writeThinLinkBitcode(const Module &M,
-                                         const ModuleSummaryIndex &Index,
-                                         const ModuleHash &ModHash) {
-  assert(!WroteStrtab);
-
-  // The Mods vector is used by irsymtab::build, which requires non-const
-  // Modules in case it needs to materialize metadata. But the bitcode writer
-  // requires that the module is materialized, so we can cast to non-const here,
-  // after checking that it is in fact materialized.
-  assert(M.isMaterialized());
-  Mods.push_back(const_cast<Module *>(&M));
-
-  ThinLinkBitcodeWriter ThinLinkWriter(M, StrtabBuilder, *Stream, Index,
-                                       ModHash);
-  ThinLinkWriter.write();
-}
-
-// Write the specified thin link bitcode file to the given raw output stream,
-// where it will be written in a new bitcode block. This is used when
-// writing the per-module index file for ThinLTO.
-void llvm::WriteThinLinkBitcodeToFile(const Module &M, raw_ostream &Out,
-                                      const ModuleSummaryIndex &Index,
-                                      const ModuleHash &ModHash) {
-  SmallVector<char, 0> Buffer;
-  Buffer.reserve(256 * 1024);
-
-  BitcodeWriter Writer(Buffer);
-  Writer.writeThinLinkBitcode(M, Index, ModHash);
-  Writer.writeSymtab();
-  Writer.writeStrtab();
-
-  Out.write((char *)&Buffer.front(), Buffer.size());
-}
-
-static const char *getSectionNameForBitcode(const Triple &T) {
-  switch (T.getObjectFormat()) {
-  case Triple::MachO:
-    return "__LLVM,__bitcode";
-  case Triple::COFF:
-  case Triple::ELF:
-  case Triple::Wasm:
-  case Triple::UnknownObjectFormat:
-    return ".llvmbc";
+} 
+ 
+void IndexBitcodeWriter::write() { 
+  Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 
+ 
+  writeModuleVersion(); 
+ 
+  // Write the module paths in the combined index. 
+  writeModStrings(); 
+ 
+  // Write the summary combined index records. 
+  writeCombinedGlobalValueSummary(); 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+// Write the specified module summary index to the given raw output stream, 
+// where it will be written in a new bitcode block. This is used when 
+// writing the combined index file for ThinLTO. When writing a subset of the 
+// index for a distributed backend, provide a \p ModuleToSummariesForIndex map. 
+void llvm::WriteIndexToFile( 
+    const ModuleSummaryIndex &Index, raw_ostream &Out, 
+    const std::map<std::string, GVSummaryMapTy> *ModuleToSummariesForIndex) { 
+  SmallVector<char, 0> Buffer; 
+  Buffer.reserve(256 * 1024); 
+ 
+  BitcodeWriter Writer(Buffer); 
+  Writer.writeIndex(&Index, ModuleToSummariesForIndex); 
+  Writer.writeStrtab(); 
+ 
+  Out.write((char *)&Buffer.front(), Buffer.size()); 
+} 
+ 
+namespace { 
+ 
+/// Class to manage the bitcode writing for a thin link bitcode file. 
+class ThinLinkBitcodeWriter : public ModuleBitcodeWriterBase { 
+  /// ModHash is for use in ThinLTO incremental build, generated while writing 
+  /// the module bitcode file. 
+  const ModuleHash *ModHash; 
+ 
+public: 
+  ThinLinkBitcodeWriter(const Module &M, StringTableBuilder &StrtabBuilder, 
+                        BitstreamWriter &Stream, 
+                        const ModuleSummaryIndex &Index, 
+                        const ModuleHash &ModHash) 
+      : ModuleBitcodeWriterBase(M, StrtabBuilder, Stream, 
+                                /*ShouldPreserveUseListOrder=*/false, &Index), 
+        ModHash(&ModHash) {} 
+ 
+  void write(); 
+ 
+private: 
+  void writeSimplifiedModuleInfo(); 
+}; 
+ 
+} // end anonymous namespace 
+ 
+// This function writes a simpilified module info for thin link bitcode file. 
+// It only contains the source file name along with the name(the offset and 
+// size in strtab) and linkage for global values. For the global value info 
+// entry, in order to keep linkage at offset 5, there are three zeros used 
+// as padding. 
+void ThinLinkBitcodeWriter::writeSimplifiedModuleInfo() { 
+  SmallVector<unsigned, 64> Vals; 
+  // Emit the module's source file name. 
+  { 
+    StringEncoding Bits = getStringEncoding(M.getSourceFileName()); 
+    BitCodeAbbrevOp AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8); 
+    if (Bits == SE_Char6) 
+      AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Char6); 
+    else if (Bits == SE_Fixed7) 
+      AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7); 
+ 
+    // MODULE_CODE_SOURCE_FILENAME: [namechar x N] 
+    auto Abbv = std::make_shared<BitCodeAbbrev>(); 
+    Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_SOURCE_FILENAME)); 
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array)); 
+    Abbv->Add(AbbrevOpToUse); 
+    unsigned FilenameAbbrev = Stream.EmitAbbrev(std::move(Abbv)); 
+ 
+    for (const auto P : M.getSourceFileName()) 
+      Vals.push_back((unsigned char)P); 
+ 
+    Stream.EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals, FilenameAbbrev); 
+    Vals.clear(); 
+  } 
+ 
+  // Emit the global variable information. 
+  for (const GlobalVariable &GV : M.globals()) { 
+    // GLOBALVAR: [strtab offset, strtab size, 0, 0, 0, linkage] 
+    Vals.push_back(StrtabBuilder.add(GV.getName())); 
+    Vals.push_back(GV.getName().size()); 
+    Vals.push_back(0); 
+    Vals.push_back(0); 
+    Vals.push_back(0); 
+    Vals.push_back(getEncodedLinkage(GV)); 
+ 
+    Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals); 
+    Vals.clear(); 
+  } 
+ 
+  // Emit the function proto information. 
+  for (const Function &F : M) { 
+    // FUNCTION:  [strtab offset, strtab size, 0, 0, 0, linkage] 
+    Vals.push_back(StrtabBuilder.add(F.getName())); 
+    Vals.push_back(F.getName().size()); 
+    Vals.push_back(0); 
+    Vals.push_back(0); 
+    Vals.push_back(0); 
+    Vals.push_back(getEncodedLinkage(F)); 
+ 
+    Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals); 
+    Vals.clear(); 
+  } 
+ 
+  // Emit the alias information. 
+  for (const GlobalAlias &A : M.aliases()) { 
+    // ALIAS: [strtab offset, strtab size, 0, 0, 0, linkage] 
+    Vals.push_back(StrtabBuilder.add(A.getName())); 
+    Vals.push_back(A.getName().size()); 
+    Vals.push_back(0); 
+    Vals.push_back(0); 
+    Vals.push_back(0); 
+    Vals.push_back(getEncodedLinkage(A)); 
+ 
+    Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals); 
+    Vals.clear(); 
+  } 
+ 
+  // Emit the ifunc information. 
+  for (const GlobalIFunc &I : M.ifuncs()) { 
+    // IFUNC: [strtab offset, strtab size, 0, 0, 0, linkage] 
+    Vals.push_back(StrtabBuilder.add(I.getName())); 
+    Vals.push_back(I.getName().size()); 
+    Vals.push_back(0); 
+    Vals.push_back(0); 
+    Vals.push_back(0); 
+    Vals.push_back(getEncodedLinkage(I)); 
+ 
+    Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals); 
+    Vals.clear(); 
+  } 
+} 
+ 
+void ThinLinkBitcodeWriter::write() { 
+  Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3); 
+ 
+  writeModuleVersion(); 
+ 
+  writeSimplifiedModuleInfo(); 
+ 
+  writePerModuleGlobalValueSummary(); 
+ 
+  // Write module hash. 
+  Stream.EmitRecord(bitc::MODULE_CODE_HASH, ArrayRef<uint32_t>(*ModHash)); 
+ 
+  Stream.ExitBlock(); 
+} 
+ 
+void BitcodeWriter::writeThinLinkBitcode(const Module &M, 
+                                         const ModuleSummaryIndex &Index, 
+                                         const ModuleHash &ModHash) { 
+  assert(!WroteStrtab); 
+ 
+  // The Mods vector is used by irsymtab::build, which requires non-const 
+  // Modules in case it needs to materialize metadata. But the bitcode writer 
+  // requires that the module is materialized, so we can cast to non-const here, 
+  // after checking that it is in fact materialized. 
+  assert(M.isMaterialized()); 
+  Mods.push_back(const_cast<Module *>(&M)); 
+ 
+  ThinLinkBitcodeWriter ThinLinkWriter(M, StrtabBuilder, *Stream, Index, 
+                                       ModHash); 
+  ThinLinkWriter.write(); 
+} 
+ 
+// Write the specified thin link bitcode file to the given raw output stream, 
+// where it will be written in a new bitcode block. This is used when 
+// writing the per-module index file for ThinLTO. 
+void llvm::WriteThinLinkBitcodeToFile(const Module &M, raw_ostream &Out, 
+                                      const ModuleSummaryIndex &Index, 
+                                      const ModuleHash &ModHash) { 
+  SmallVector<char, 0> Buffer; 
+  Buffer.reserve(256 * 1024); 
+ 
+  BitcodeWriter Writer(Buffer); 
+  Writer.writeThinLinkBitcode(M, Index, ModHash); 
+  Writer.writeSymtab(); 
+  Writer.writeStrtab(); 
+ 
+  Out.write((char *)&Buffer.front(), Buffer.size()); 
+} 
+ 
+static const char *getSectionNameForBitcode(const Triple &T) { 
+  switch (T.getObjectFormat()) { 
+  case Triple::MachO: 
+    return "__LLVM,__bitcode"; 
+  case Triple::COFF: 
+  case Triple::ELF: 
+  case Triple::Wasm: 
+  case Triple::UnknownObjectFormat: 
+    return ".llvmbc"; 
   case Triple::GOFF:
     llvm_unreachable("GOFF is not yet implemented");
     break;
-  case Triple::XCOFF:
-    llvm_unreachable("XCOFF is not yet implemented");
-    break;
-  }
-  llvm_unreachable("Unimplemented ObjectFormatType");
-}
-
-static const char *getSectionNameForCommandline(const Triple &T) {
-  switch (T.getObjectFormat()) {
-  case Triple::MachO:
-    return "__LLVM,__cmdline";
-  case Triple::COFF:
-  case Triple::ELF:
-  case Triple::Wasm:
-  case Triple::UnknownObjectFormat:
-    return ".llvmcmd";
+  case Triple::XCOFF: 
+    llvm_unreachable("XCOFF is not yet implemented"); 
+    break; 
+  } 
+  llvm_unreachable("Unimplemented ObjectFormatType"); 
+} 
+ 
+static const char *getSectionNameForCommandline(const Triple &T) { 
+  switch (T.getObjectFormat()) { 
+  case Triple::MachO: 
+    return "__LLVM,__cmdline"; 
+  case Triple::COFF: 
+  case Triple::ELF: 
+  case Triple::Wasm: 
+  case Triple::UnknownObjectFormat: 
+    return ".llvmcmd"; 
   case Triple::GOFF:
     llvm_unreachable("GOFF is not yet implemented");
     break;
-  case Triple::XCOFF:
-    llvm_unreachable("XCOFF is not yet implemented");
-    break;
-  }
-  llvm_unreachable("Unimplemented ObjectFormatType");
-}
-
-void llvm::EmbedBitcodeInModule(llvm::Module &M, llvm::MemoryBufferRef Buf,
+  case Triple::XCOFF: 
+    llvm_unreachable("XCOFF is not yet implemented"); 
+    break; 
+  } 
+  llvm_unreachable("Unimplemented ObjectFormatType"); 
+} 
+ 
+void llvm::EmbedBitcodeInModule(llvm::Module &M, llvm::MemoryBufferRef Buf, 
                                 bool EmbedBitcode, bool EmbedCmdline,
                                 const std::vector<uint8_t> &CmdArgs) {
-  // Save llvm.compiler.used and remove it.
-  SmallVector<Constant *, 2> UsedArray;
-  SmallPtrSet<GlobalValue *, 4> UsedGlobals;
-  Type *UsedElementType = Type::getInt8Ty(M.getContext())->getPointerTo(0);
-  GlobalVariable *Used = collectUsedGlobalVariables(M, UsedGlobals, true);
-  for (auto *GV : UsedGlobals) {
-    if (GV->getName() != "llvm.embedded.module" &&
-        GV->getName() != "llvm.cmdline")
-      UsedArray.push_back(
-          ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, UsedElementType));
-  }
-  if (Used)
-    Used->eraseFromParent();
-
-  // Embed the bitcode for the llvm module.
-  std::string Data;
-  ArrayRef<uint8_t> ModuleData;
-  Triple T(M.getTargetTriple());
-
-  if (EmbedBitcode) {
+  // Save llvm.compiler.used and remove it. 
+  SmallVector<Constant *, 2> UsedArray; 
+  SmallPtrSet<GlobalValue *, 4> UsedGlobals; 
+  Type *UsedElementType = Type::getInt8Ty(M.getContext())->getPointerTo(0); 
+  GlobalVariable *Used = collectUsedGlobalVariables(M, UsedGlobals, true); 
+  for (auto *GV : UsedGlobals) { 
+    if (GV->getName() != "llvm.embedded.module" && 
+        GV->getName() != "llvm.cmdline") 
+      UsedArray.push_back( 
+          ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, UsedElementType)); 
+  } 
+  if (Used) 
+    Used->eraseFromParent(); 
+ 
+  // Embed the bitcode for the llvm module. 
+  std::string Data; 
+  ArrayRef<uint8_t> ModuleData; 
+  Triple T(M.getTargetTriple()); 
+
+  if (EmbedBitcode) { 
     if (Buf.getBufferSize() == 0 ||
         !isBitcode((const unsigned char *)Buf.getBufferStart(),
-                   (const unsigned char *)Buf.getBufferEnd())) {
-      // If the input is LLVM Assembly, bitcode is produced by serializing
-      // the module. Use-lists order need to be preserved in this case.
-      llvm::raw_string_ostream OS(Data);
-      llvm::WriteBitcodeToFile(M, OS, /* ShouldPreserveUseListOrder */ true);
-      ModuleData =
-          ArrayRef<uint8_t>((const uint8_t *)OS.str().data(), OS.str().size());
-    } else
-      // If the input is LLVM bitcode, write the input byte stream directly.
-      ModuleData = ArrayRef<uint8_t>((const uint8_t *)Buf.getBufferStart(),
-                                     Buf.getBufferSize());
-  }
-  llvm::Constant *ModuleConstant =
-      llvm::ConstantDataArray::get(M.getContext(), ModuleData);
-  llvm::GlobalVariable *GV = new llvm::GlobalVariable(
-      M, ModuleConstant->getType(), true, llvm::GlobalValue::PrivateLinkage,
-      ModuleConstant);
-  GV->setSection(getSectionNameForBitcode(T));
+                   (const unsigned char *)Buf.getBufferEnd())) { 
+      // If the input is LLVM Assembly, bitcode is produced by serializing 
+      // the module. Use-lists order need to be preserved in this case. 
+      llvm::raw_string_ostream OS(Data); 
+      llvm::WriteBitcodeToFile(M, OS, /* ShouldPreserveUseListOrder */ true); 
+      ModuleData = 
+          ArrayRef<uint8_t>((const uint8_t *)OS.str().data(), OS.str().size()); 
+    } else 
+      // If the input is LLVM bitcode, write the input byte stream directly. 
+      ModuleData = ArrayRef<uint8_t>((const uint8_t *)Buf.getBufferStart(), 
+                                     Buf.getBufferSize()); 
+  } 
+  llvm::Constant *ModuleConstant = 
+      llvm::ConstantDataArray::get(M.getContext(), ModuleData); 
+  llvm::GlobalVariable *GV = new llvm::GlobalVariable( 
+      M, ModuleConstant->getType(), true, llvm::GlobalValue::PrivateLinkage, 
+      ModuleConstant); 
+  GV->setSection(getSectionNameForBitcode(T)); 
   // Set alignment to 1 to prevent padding between two contributions from input
   // sections after linking.
   GV->setAlignment(Align(1));
-  UsedArray.push_back(
-      ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, UsedElementType));
-  if (llvm::GlobalVariable *Old =
-          M.getGlobalVariable("llvm.embedded.module", true)) {
-    assert(Old->hasOneUse() &&
-           "llvm.embedded.module can only be used once in llvm.compiler.used");
-    GV->takeName(Old);
-    Old->eraseFromParent();
-  } else {
-    GV->setName("llvm.embedded.module");
-  }
-
-  // Skip if only bitcode needs to be embedded.
+  UsedArray.push_back( 
+      ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, UsedElementType)); 
+  if (llvm::GlobalVariable *Old = 
+          M.getGlobalVariable("llvm.embedded.module", true)) { 
+    assert(Old->hasOneUse() && 
+           "llvm.embedded.module can only be used once in llvm.compiler.used"); 
+    GV->takeName(Old); 
+    Old->eraseFromParent(); 
+  } else { 
+    GV->setName("llvm.embedded.module"); 
+  } 
+ 
+  // Skip if only bitcode needs to be embedded. 
   if (EmbedCmdline) {
-    // Embed command-line options.
+    // Embed command-line options. 
     ArrayRef<uint8_t> CmdData(const_cast<uint8_t *>(CmdArgs.data()),
                               CmdArgs.size());
-    llvm::Constant *CmdConstant =
-        llvm::ConstantDataArray::get(M.getContext(), CmdData);
-    GV = new llvm::GlobalVariable(M, CmdConstant->getType(), true,
-                                  llvm::GlobalValue::PrivateLinkage,
-                                  CmdConstant);
-    GV->setSection(getSectionNameForCommandline(T));
+    llvm::Constant *CmdConstant = 
+        llvm::ConstantDataArray::get(M.getContext(), CmdData); 
+    GV = new llvm::GlobalVariable(M, CmdConstant->getType(), true, 
+                                  llvm::GlobalValue::PrivateLinkage, 
+                                  CmdConstant); 
+    GV->setSection(getSectionNameForCommandline(T)); 
     GV->setAlignment(Align(1));
-    UsedArray.push_back(
-        ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, UsedElementType));
-    if (llvm::GlobalVariable *Old = M.getGlobalVariable("llvm.cmdline", true)) {
-      assert(Old->hasOneUse() &&
-             "llvm.cmdline can only be used once in llvm.compiler.used");
-      GV->takeName(Old);
-      Old->eraseFromParent();
-    } else {
-      GV->setName("llvm.cmdline");
-    }
-  }
-
-  if (UsedArray.empty())
-    return;
-
-  // Recreate llvm.compiler.used.
-  ArrayType *ATy = ArrayType::get(UsedElementType, UsedArray.size());
-  auto *NewUsed = new GlobalVariable(
-      M, ATy, false, llvm::GlobalValue::AppendingLinkage,
-      llvm::ConstantArray::get(ATy, UsedArray), "llvm.compiler.used");
-  NewUsed->setSection("llvm.metadata");
-}
+    UsedArray.push_back( 
+        ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, UsedElementType)); 
+    if (llvm::GlobalVariable *Old = M.getGlobalVariable("llvm.cmdline", true)) { 
+      assert(Old->hasOneUse() && 
+             "llvm.cmdline can only be used once in llvm.compiler.used"); 
+      GV->takeName(Old); 
+      Old->eraseFromParent(); 
+    } else { 
+      GV->setName("llvm.cmdline"); 
+    } 
+  } 
+ 
+  if (UsedArray.empty()) 
+    return; 
+ 
+  // Recreate llvm.compiler.used. 
+  ArrayType *ATy = ArrayType::get(UsedElementType, UsedArray.size()); 
+  auto *NewUsed = new GlobalVariable( 
+      M, ATy, false, llvm::GlobalValue::AppendingLinkage, 
+      llvm::ConstantArray::get(ATy, UsedArray), "llvm.compiler.used"); 
+  NewUsed->setSection("llvm.metadata"); 
+}