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Commit 79bb915f authored by Sanjay Patel's avatar Sanjay Patel
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[InstCombine] enhance fold for subtract-from-constant -> xor 

A low-bit mask is not required:
https://alive2.llvm.org/ce/z/yPShss

This matches the SDAG implementation that was updated at:
8b756713
parent 0cf5d40d
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