[llvm] [SCEV] Fold (C1 * A /u C2) -> A /u (C2 /u C1), if C2 > C1. (PR #157656)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

rebased after landing https://github.com/llvm/llvm-project/pull/157555

https://github.com/llvm/llvm-project/pull/157656