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Commit 2a0ca17f authored by Simon Pilgrim's avatar Simon Pilgrim
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[InstCombine] collectBitParts - add fshl/fshr handling 

Pulled from D87452, this is a fixed version of the collectBitParts fshl/fshr handling which as @nikic noticed wasn't checking for different providers or had correct bit ordering (which was hid by only testing shift amounts of bitwidth/2).

Differential Revision: https://reviews.llvm.org/D88292
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