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Simon Pilgrim b87ffe8519 [X86][XOP] BITREVERSE lowering using VPPERM 
XOP's VPPERM has some great 'permute operations' that it can do as well as part of shuffling the bytes of a 128-bit vector - in this case we use it to perform BITREVERSE in a single instruction.

llvm-svn: 264870
 2016-03-30 14:14:00 +00:00