[PATCH] [CodeGen] Add hooks/combine to form vector extloads, and enable it on X86.

[Ahmed Bougacha]

http://reviews.llvm.org/D6904

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/X86/vector-sext.ll
  test/CodeGen/X86/vector-zext.ll

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