[llvm] [GlobalISel]: Simplify udiv lowering by determining known zeros (PR #89678)

[Jay Foad via llvm-commits]

jayfoad wrote:

@AtariDreams why do you keep force-pushing? It makes it hard for reviewers to know what has changed since the last time they looked at the PR.

https://github.com/llvm/llvm-project/pull/89678