[llvm] [NVPTX] Prefer prmt.b32 over bfi.b32 (PR #110766)

[Emilio Cota via llvm-commits]

cota wrote:

Thanks @akuegel for pointing that out. I will revert this now since that confirms that this commit is the root cause of the failures we are seeing in our downstream tests (gross numerical disparities), despite no upstream tests being broken.

https://github.com/llvm/llvm-project/pull/110766