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Commit 5ca325e4 authored by Noah Goldstein's avatar Noah Goldstein
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[InstCombine] Detect `(x ^ -x)` as a ~Mask 

Proof: https://alive2.llvm.org/ce/z/TAFmPw

This is a lemma for clearing up some of the regressions that #84688
causes.

Closes #84868
parent 377da515
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