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This patch adds support for decoding XOP VPPERM instruction when it represents a basic shuffle. The mask decoding required the existing MCInstrLowering code to be updated to support binary shuffles - the implementation now matches what is done in X86InstrComments.cpp. Differential Revision: http://reviews.llvm.org/D18441 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265874 91177308-0d34-0410-b5e6-96231b3b80d8