[llvm] [polly] [SCEV] Introduce SCEVUse, use it instead of const SCEV * (NFCI) (WIP). (PR #91961)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon commented:

This is a very interesting patch! I can definitely see the value of having non-global SCEV flags, and I hope I was able to leave some comments that can help improve it.

https://github.com/llvm/llvm-project/pull/91961