[libcxx-commits] [libcxx] [lib++][test] Align `atomic_ref` underlying variable as required (PR #179780)

[A. Jiang via libcxx-commits]

https://github.com/frederick-vs-ja approved this pull request.

Thanks!

CI failures were unrelated. I'm trying to fix that in #179887.

https://github.com/llvm/llvm-project/pull/179780