[libcxx-commits] [libcxx] [libc++] Fix bug in atomic_ref's calculation of lock_free-ness (PR #99570)

[Louis Dionne via libcxx-commits]

ldionne wrote:

Note: This patch is basically @EricWF 's original #93427 with a few review comments applied. The reason for creating a new PR is because I wanted to pick it up to ensure it makes the LLVM 19 cut.

https://github.com/llvm/llvm-project/pull/99570