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

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AtariDreams wrote:

@nikic @arsenm @topperc I do not have commit perms. What do you think about merging this?

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