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

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AtariDreams wrote:

@dtcxzyw Though, it was thanks to the opt-benchmark that I reviewed by changes because something was off about the diff, and it did not seem equivalent at all.

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