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

[Simon Pilgrim]

Hi andreadb, mkuper, chandlerc,

We have an increasing number of cases where we are creating commuted shuffle masks - all implementing nearly the same code.

This patch adds a static helper function - ShuffleVectorSDNode::commuteMask() and replaces a number of cases to use it. If people know of other cases that could use it as well please comment and I will add them to the patch.

NFCI

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8139

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

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