Upd libc++ to 18 Jun 2022 ff3989e6ae740a9b3adaad0e2bf7691ffd6dad12

```
[libc++] Add Implemented Papers section
[libc++] Enable -Wweak-vtables
[libc++] Make sure we install libc++abi headers on Apple
[libc++] Don't force -O2 when building the benchmarks
[libc++] Mark standard-mandated includes as such
[libc++] Implement std::boyer_moore{, _horspool}_searcher
[libc++] Unwrap reverse_iterator<reverse_iterator<Iter>> in __unwrap_iter
[libc++] Simplify __config a bit
[libc++][ranges] Implement `ranges::sort`.
[libc++] Remove now-unused experimental/filesystem config file
[libc++] Robust against C++20-hostile iterators
[libc++] Implement ranges::lexicographical_compare
[libc++] Removes unneeded <iterator> includes.
[libcxx] Fix allocator<void>::pointer in C++20 with removed members
[libcxx] Remove extraneous '---' lines in .clang-format files
[libc++][NFCI] span: replace enable_if with concepts
[libc++] Find a clang-format everybody is happy with
[libc++] Use explicit module cache path in tests
[libc++] Remove macros for IBM compiler
```

1 files changed, 3 insertions, 0 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/__functional/function.h b/contrib/libs/cxxsupp/libcxx/include/__functional/function.h
index 8ff6ff44cb9..d1c815bd8a6 100644
--- a/contrib/libs/cxxsupp/libcxx/include/__functional/function.h
+++ b/contrib/libs/cxxsupp/libcxx/include/__functional/function.h
@@ -35,6 +35,8 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 // bad_function_call
 
+_LIBCPP_DIAGNOSTIC_PUSH
+_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wweak-vtables")
 class _LIBCPP_EXCEPTION_ABI bad_function_call
     : public exception
 {
@@ -52,6 +54,7 @@ public:
     virtual const char* what() const _NOEXCEPT;
 #endif
 };
+_LIBCPP_DIAGNOSTIC_POP
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_bad_function_call()