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

1 files changed, 3 insertions, 3 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/__ranges/subrange.h b/contrib/libs/cxxsupp/libcxx/include/__ranges/subrange.h
index 8e984f2bf0..76adbffef6 100644
--- a/contrib/libs/cxxsupp/libcxx/include/__ranges/subrange.h
+++ b/contrib/libs/cxxsupp/libcxx/include/__ranges/subrange.h
@@ -80,9 +80,9 @@ namespace ranges {
     static constexpr bool _MustProvideSizeAtConstruction = !_StoreSize; // just to improve compiler diagnostics
     struct _Empty { constexpr _Empty(auto) noexcept { } };
     using _Size = conditional_t<_StoreSize, make_unsigned_t<iter_difference_t<_Iter>>, _Empty>;
-    [[no_unique_address]] _Iter __begin_ = _Iter();
-    [[no_unique_address]] _Sent __end_ = _Sent();
-    [[no_unique_address]] _Size __size_ = 0;
+    _LIBCPP_NO_UNIQUE_ADDRESS _Iter __begin_ = _Iter();
+    _LIBCPP_NO_UNIQUE_ADDRESS _Sent __end_ = _Sent();
+    _LIBCPP_NO_UNIQUE_ADDRESS _Size __size_ = 0;
 
   public:
     _LIBCPP_HIDE_FROM_ABI