[libcxx-commits] [libcxx] [libc++] Implement P0493R5: Atomic minimum/maximum (PR #180333)

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https://github.com/huixie90 requested changes to this pull request.

I think the source code LGTM. I made some comments on the tests. I understand some tests were inspired by the old tests. but it would be good to follow the practice of our newly created tests

https://github.com/llvm/llvm-project/pull/180333