[llvm] [NVPTX] Preserve volatile on atomic local loads and stores (PR #224719)

[Antonio Frighetto via llvm-commits]

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

Seems reasonable, thanks! (Maybe worth mentioning in the description this follows up on https://github.com/llvm/llvm-project/pull/217764.)

https://github.com/llvm/llvm-project/pull/224719