[llvm] [NVPTX] Add Read/Write/SideEffect attributes to atomic instructions (PR #109665)

[Artem Belevich via llvm-commits]

https://github.com/Artem-B approved this pull request.

LGTM overall.

Do you have any specific examples demonstrating incorrect behavior we have now?
It may be useful to add a test case for that.

https://github.com/llvm/llvm-project/pull/109665