[llvm] [NVPTX] Legalize aext-load to zext-load to expose more DAG combines (PR #154251)

[Artem Belevich via llvm-commits]

https://github.com/Artem-B approved this pull request.

LGTM. 

So, in practice, the only observable effect on the tests is on loading i8 scalars that we store in i16 registers.

https://github.com/llvm/llvm-project/pull/154251