[llvm] [NVPTX] cleanup & canonicalize `mov` (PR #129344)

[Thomas Raoux via llvm-commits]

ThomasRaoux wrote:

> For what it's worth, we do not see any interesting failures that may have been caused by this patch, and it's been in use by XLA for about a week now and I'd expect a major issue like this to surface by now.

thanks for sharing, this is good to know, it must be a niche case then. Looks like it only affects one of our kernel and we found a workaround for now. This is clearly a ptxas bug though, we'll try to see if Nvidia can fix it. 

https://github.com/llvm/llvm-project/pull/129344