[llvm] [polly] [SCEV] Introduce SDiv expressions (PR #216862)

[Florian Hahn via llvm-commits]

fhahn wrote:

> Included in description, thanks. There are improvements from analyzing sdiv instructions in IR, independently of any stride expressions, and the compile-time increase is in noise anyway.

With example I meant an example loop (IR) to show a concrete motivating case.

https://github.com/llvm/llvm-project/pull/216862