[libcxx-commits] [libcxx] [libc++] Improve diagnostic when violating `std::atomic` trivially copyable mandates (PR #131754)

[Louis Dionne via libcxx-commits]

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

Thanks for the patch. This is a good improvement, and the fact that the test would previously be equivalent to a `.compile.fail.cpp` was really surprising to me. 

Looks like we need to eradicate `-Xclang -verify-ignore-unexpected=error` from our verify tests.

https://github.com/llvm/llvm-project/pull/131754