[llvm] [NVPTX] Stop using 16-bit CAS instructions from PTX (PR #119349)

[Artem Belevich via llvm-commits]

Artem-B wrote:

Not sure if the pull request was closed intentionally.

Is there a particular reason for not allowing 16-bit CAS? AFAICT, it is supported by PTX. What was the motivation for this change?

https://github.com/llvm/llvm-project/pull/119349