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

[Guray Ozen via llvm-commits]

grypp wrote:

> > Looks good to me.
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> > 
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> > Out of curiosity do we have maximum integer limit for `bulk.wait.group` ?
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> Not sure. I am checking here.
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> Even if a limit exists, I am afraid I may not be able to add a check, until it gets updated/documented in the public PTX spec.

Thanks for checking. I also cannot see it in the PTX doc. 

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