[PATCH] [DAGCombine] Don't generate atrocious shuffles for constant vectors

[Michael Kuperstein]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7093

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  llvm/trunk/test/CodeGen/X86/splat-const.ll
  llvm/trunk/test/CodeGen/X86/sse41.ll
  llvm/trunk/test/CodeGen/X86/widen_shuffle-1.ll

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