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e4eb76cebd
VPAND is a lot faster than VPSHUFB and VPBLENDVB - this patch ensures we attempt to lower to a basic bitmask before lowering to the slower byte shuffle/blend instructions. Split off from D11518. Differential Revision: http://reviews.llvm.org/D11541 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243395 91177308-0d34-0410-b5e6-96231b3b80d8
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