[libcxx] [clang] [Clang][libc++] Implement __is_nothrow_convertible and use it in libc++ (PR #80436)

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https://github.com/cor3ntin approved this pull request.

Front end changes looks good.
It would be nice to add a release note on the clang side

https://github.com/llvm/llvm-project/pull/80436