[llvm] [InstCombine] Fold ((X << nuw Z) binop nuw Y) >>u Z --> X binop nuw (Y >>u Z) (PR #88193)

[via llvm-commits]

AtariDreams wrote:

I just realized I forgot to fix the order of the sub because the order matters, we do not canonicalize it.

I fixed the miscompile, I apologize @dtcxzyw 

https://github.com/llvm/llvm-project/pull/88193