[llvm] Reland "[InstCombine] Fold (sub nuw X, (Y << nuw Z)) >>u exact Z --> (X >>u exact Z) sub nuw Y" (PR #93571)

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Thu May 30 06:34:45 PDT 2024

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AtariDreams wrote:

@dtcxzyw I did all the possible negative tests. 

I think this can be merged now!

https://github.com/llvm/llvm-project/pull/93571

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