[PATCH] [X86][PCLMUL] Enable commutation for PCLMUL instructions

[Simon Pilgrim]

Hi qcolombet, spatel, mkuper,

Patch to allow (v)pclmulqdq to be commuted - swaps the src registers and inverts the immediate (low/high) src mask.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7180

Files:
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/commute-clmul.ll

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