[PATCH] [DAGCombiner] Add a shuffle mask commutation helper function.

[Simon Pilgrim]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8139

Files:
  llvm/trunk/include/llvm/CodeGen/SelectionDAGNodes.h
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

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