[PATCH] Generate better code for shuffles

[Michael Kuperstein]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6678

Files:
  llvm/trunk/include/llvm/Target/TargetLowering.h
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
  llvm/trunk/lib/Target/X86/X86ISelLowering.h
  llvm/trunk/test/CodeGen/X86/vec_extract-avx.ll
  llvm/trunk/test/CodeGen/X86/vector-shuffle-combining.ll

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