[llvm] [LLVM][NVPTX] Add NVPTX codegen support for clusterlaunchcontrol instruction (PR #134568)

[Artem Belevich via llvm-commits]

Artem-B wrote:

@schwarzschild-radius would it be possible to go over still open comments and mark the ones you've addressed as resolved? Right now it's really hard to tell whether you're still working on all/some of them, or if they are done.

https://github.com/llvm/llvm-project/pull/134568