[llvm] [LLVM][SCEV] udiv (mul nuw a, vscale), (mul nuw b, vscale) -> udiv a, b (PR #157836)

[Nikita Popov via llvm-commits]

https://github.com/nikic approved this pull request.

LGTM. This is likely worth generalizing to the general case, but I'm ok with landing this first.

https://github.com/llvm/llvm-project/pull/157836