[libcxx-commits] [libcxx] [libc++] Disables -Wweak-vtables diagnostics. (PR #85577)

[Louis Dionne via libcxx-commits]

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

I am fine with this change as-is. It unblocks a Clang migration and it is consistent with what we do for `bad_function_call`. We should investigate how we can use availability instead for both `bad_function_call` and `bad_expected_access`, but that can (and should) be done in a separate patch cause it's non-trivial from an ABI standpoint.

https://github.com/llvm/llvm-project/pull/85577