[PATCH] Generate better code for shuffles

[Michael Kuperstein]

Fixed my own test (thanks Sanjay) and added the test case from http://reviews.llvm.org/D6622


http://reviews.llvm.org/D6678

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

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