[llvm] Partial revert "[NVPTX] Enhance mul.wide and mad.wide peepholes#150477" (PR #155024)

[Justin Fargnoli via llvm-commits]

justinfargnoli wrote:

> I'd guess that some ptxas peephole isn't being triggered.

Also, I'd guess that this only matters when the `add`/`mad.wide` is used as the address to a `load`. The other cases are probably okay. 

https://github.com/llvm/llvm-project/pull/155024