[PATCH] [X86] Try to combine vector anyext + and into a vector zext

[Michael Kuperstein]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7666

Files:
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
  llvm/trunk/test/CodeGen/X86/vector-zext.ll

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