Update libc++ to b6d87773 (14 Jan 2022).

Notable changes:
* implement operator << for filesystem::directory_entry
* add std::ranges::in_in_result
* add std::ranges::owning_view
* add std::ranges::cdata
* add std::ranges::construct_at and destroy{,_n,_at}
* small fixes in std::ranges::data
* SFINAE away std::ranges::cbegin(const T&&) for non-borrowed T
* use arc4random to implement std::random_device on Apple
* introduce __fits_in_sso to put constexpr check into a central place
* introduce __debug_db_insert_c to put #if and constexpr check into a central place

ref:b3dd06bd52f06e8939227ca0f0a5873d0c211e48

2 files changed, 45 insertions, 2 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_result.h b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_result.h
new file mode 100644
index 0000000000..a1416f4cac
--- /dev/null
+++ b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_in_result.h
@@ -0,0 +1,43 @@
+// -*- 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_RESULT_H
+#define _LIBCPP___ALGORITHM_IN_IN_RESULT_H
+
+#include <__concepts/convertible_to.h>
+#include <__config>
+#include <__utility/move.h>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#ifndef _LIBCPP_HAS_NO_RANGES
+
+namespace ranges {
+template <class _I1, class _I2>
+struct in_in_result {
+  _LIBCPP_NO_UNIQUE_ADDRESS _I1 in1;
+  _LIBCPP_NO_UNIQUE_ADDRESS _I2 in2;
+
+  template <class _II1, class _II2>
+    requires convertible_to<const _I1&, _II1> && convertible_to<const _I2&, _II2>
+  constexpr operator in_in_result<_II1, _II2>() const & {
+    return {in1, in2};
+  }
+
+  template <class _II1, class _II2>
+    requires convertible_to<_I1, _II1> && convertible_to<_I2, _II2>
+    constexpr operator in_in_result<_II1, _II2>() && { return {_VSTD::move(in1), _VSTD::move(in2)}; }
+};
+} // namespace ranges
+
+#endif // _LIBCPP_HAS_NO_RANGES
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ALGORITHM_IN_IN_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 9d97115720..1aebfa86a4 100644
--- a/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_out_result.h
+++ b/contrib/libs/cxxsupp/libcxx/include/__algorithm/in_out_result.h
@@ -25,8 +25,8 @@ namespace ranges {
 
 template<class _InputIterator, class _OutputIterator>
 struct in_out_result {
-  [[no_unique_address]] _InputIterator in;
-  [[no_unique_address]] _OutputIterator out;
+  _LIBCPP_NO_UNIQUE_ADDRESS _InputIterator in;
+  _LIBCPP_NO_UNIQUE_ADDRESS _OutputIterator out;
 
   template <class _InputIterator2, class _OutputIterator2>
     requires convertible_to<const _InputIterator&, _InputIterator2> && convertible_to<const _OutputIterator&,