[llvm] [NVPTX] fix emission for i1 load and extload (PR #99392)

[Artem Belevich via llvm-commits]

Artem-B wrote:

> Thanks! Please use my author details [...]

It will be whatever you used in your git commit. I just mash the button on github. The final commit will be "Authored by <you>, Committed by <me>".

I'll merge it tomorrow. Let me know if you want me to hold it for longer, if you need more time to update the pull request.

https://github.com/llvm/llvm-project/pull/99392