[llvm] [CodeGenPrepare] Folding `urem` with loop invariant value as remainder (PR #96625)

[via llvm-commits]

goldsteinn wrote:

> > @goldsteinn Looks like [c64ce8b](https://github.com/llvm/llvm-project/commit/c64ce8bf283120fd145a57d0e61f9697f719139d) might break aarch64 stage2. Guessing miscompilation.
> 
> Yeah I see, I am trying to repro locally. I'll revert for now as not sure of the exact issue.

Reverted: https://github.com/llvm/llvm-project/commit/731ae694a3d8f4d39e855c9a82c97d4f170fd48a

https://github.com/llvm/llvm-project/pull/96625