[X86] Rewrite lowerVectorShuffleWithPSHUFB to not require a ZeroableMask to be...
[X86] Rewrite lowerVectorShuffleWithPSHUFB to not require a ZeroableMask to be created. We can do everything with the starting mask and zeroable bit vector. This removes the last usage of isSingleInputShuffleMask. NFC llvm-svn: 273804
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