[InstCombine] Use existing `(icmp pred (add x, y), C)` folds with `or disjoint`#87937

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goldsteinn wants to merge 3 commits intollvm:mainfrom goldsteinn:goldsteinn/icmp-add-or-disjoint-or

+72-49

Commits on Apr 7, 2024

[InstCombine] Add tests for folding (icmp eq/ne (add nuw x, y), 0); NFC
goldsteinn
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[InstCombine] Fold (icmp eq/ne (add nuw x, y), 0) -> (icmp eq/ne (or x, y), 0)
goldsteinn
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[InstCombine] Use existing (icmp pred (add x, y), C) folds with or disjoint
goldsteinn
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