Update libc++ to eaadc451 (4 Feb 2022).

Notable changes:
* fix chrono::duration constructor constraint
* delete base class for std::basic_string
* add ranges::in_out_out_result and ranges::in_in_out_result
* implement indirectly_copyable{,_storable} concepts
* rename __referenceable to __can_reference to match text of the standard
* add _LIBCPP_HAS_NO_CONCEPTS guards where concepts are used
* simplify no concepts guards
* add specifications for basic_common_reference and common_type for pair
* make _VSTD an alias for std so that it can be removed in the future
* remove std from friend declaration to facilitate switch from _VSTD to std
* fix TOCTOU issue with std::filesystem::remove_all
* add additional constraints to std::ranges::get for subranges when N == 0
* pick unique bit for __regex_word constant
* use vsnprintf instead of _vsnprintf on Windows
* ADL-proof ranges::iter_swap and ranges::iter_move
* implement std::ranges::distance
* merge _LIBCPP_HAS_NO_RANGES into _LIBCPP_HAS_NO_CONCEPTS

ref:b637aa39f39243eeac99a2109af1daaac7c29316

4 files changed, 114 insertions, 4 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_out_result.h b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_out_result.h
new file mode 100644
index 0000000000..8130f80867
--- /dev/null
+++ b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_out_result.h
@@ -0,0 +1,54 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_IN_IN_OUT_RESULT_H
+#define _LIBCPP___ALGORITHM_IN_IN_OUT_RESULT_H
+
+#include <__concepts/convertible_to.h>
+#include <__config>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
+
+namespace ranges {
+
+template <class _I1, class _I2, class _O1>
+struct in_in_out_result {
+  _LIBCPP_NO_UNIQUE_ADDRESS _I1 in1;
+  _LIBCPP_NO_UNIQUE_ADDRESS _I2 in2;
+  _LIBCPP_NO_UNIQUE_ADDRESS _O1 out;
+
+  template <class _II1, class _II2, class _OO1>
+    requires convertible_to<const _I1&, _II1> && convertible_to<const _I2&, _II2> && convertible_to<const _O1&, _OO1>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  operator in_in_out_result<_II1, _II2, _OO1>() const& {
+    return {in1, in2, out};
+  }
+
+  template <class _II1, class _II2, class _OO1>
+    requires convertible_to<_I1, _II1> && convertible_to<_I2, _II2> && convertible_to<_O1, _OO1>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  operator in_in_out_result<_II1, _II2, _OO1>() && {
+    return {_VSTD::move(in1), _VSTD::move(in2), _VSTD::move(out)};
+  }
+};
+
+} // namespace ranges
+
+#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ALGORITHM_IN_IN_OUT_RESULT_H
diff --git a/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_result.h b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_result.h
index 22dc7453b5..48c9807a38 100644
--- a/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_result.h
+++ b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_result.h
@@ -14,11 +14,16 @@
 #include <__config>
 #include <__utility/move.h>
 
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#ifndef _LIBCPP_HAS_NO_RANGES
+#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
 
 namespace ranges {
+
 template <class _I1, class _I2>
 struct in_in_result {
   _LIBCPP_NO_UNIQUE_ADDRESS _I1 in1;
@@ -36,9 +41,10 @@ struct in_in_result {
   _LIBCPP_HIDE_FROM_ABI constexpr
   operator in_in_result<_II1, _II2>() && { return {_VSTD::move(in1), _VSTD::move(in2)}; }
 };
+
 } // namespace ranges
 
-#endif // _LIBCPP_HAS_NO_RANGES
+#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_out_out_result.h b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_out_out_result.h
new file mode 100644
index 0000000000..d37ddf99aa
--- /dev/null
+++ b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_out_out_result.h
@@ -0,0 +1,48 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_IN_OUT_OUT_RESULT_H
+#define _LIBCPP___ALGORITHM_IN_OUT_OUT_RESULT_H
+
+#include <__concepts/convertible_to.h>
+#include <__config>
+#include <__utility/move.h>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifndef _LIBCPP_HAS_NO_CONCEPTS
+
+namespace ranges {
+template <class _I1, class _O1, class _O2>
+struct in_out_out_result {
+  _LIBCPP_NO_UNIQUE_ADDRESS _I1 in;
+  _LIBCPP_NO_UNIQUE_ADDRESS _O1 out1;
+  _LIBCPP_NO_UNIQUE_ADDRESS _O2 out2;
+
+  template <class _II1, class _OO1, class _OO2>
+    requires convertible_to<const _I1&, _II1> && convertible_to<const _O1&, _OO1> && convertible_to<const _O2&, _OO2>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  operator in_out_out_result<_II1, _OO1, _OO2>() const& {
+    return {in, out1, out2};
+  }
+
+  template <class _II1, class _OO1, class _OO2>
+    requires convertible_to<_I1, _II1> && convertible_to<_O1, _OO1> && convertible_to<_O2, _OO2>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  operator in_out_out_result<_II1, _OO1, _OO2>() && {
+    return {_VSTD::move(in), _VSTD::move(out1), _VSTD::move(out2)};
+  }
+};
+} // namespace ranges
+
+#endif // _LIBCPP_HAS_NO_CONCEPTS
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ALGORITHM_IN_OUT_OUT_RESULT_H
diff --git a/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_out_result.h b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_out_result.h
index 1aebfa86a4..c8b0fe9753 100644
--- a/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_out_result.h
+++ b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_out_result.h
@@ -20,7 +20,8 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if !defined(_LIBCPP_HAS_NO_RANGES)
+#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
+
 namespace ranges {
 
 template<class _InputIterator, class _OutputIterator>
@@ -45,7 +46,8 @@ struct in_out_result {
 };
 
 } // namespace ranges
-#endif // !defined(_LIBCPP_HAS_NO_RANGES)
+
+#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
 
 _LIBCPP_END_NAMESPACE_STD