[llvm] [LLVM][NVPTX] Add cp.async.bulk.commit/wait intrinsics (PR #78698)

[Artem Belevich via llvm-commits]

Artem-B wrote:

No, the patch looks good, just making sure we're not missing anything. ptxas tests are not enabled by default and folks are usually unaware of them. They are, however, very useful when we introduce new instructions. I should probably document it... somewhere.

https://github.com/llvm/llvm-project/pull/78698