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[DAG] MatchRotate - support rotate-by-constant of illegal types
Patch to fix some of the regressions in D77804. By folding to rotate/funnel-shift by constant amounts for illegal types, we prevent SimplifyDemandedBits from destroying the patterns prematurely, allowing us to use the rotate/funnel-shift legalization that was added in D112443. Differential Revision: https://reviews.llvm.org/D113192
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Simon Pilgrim
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Nov 19, 2021
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