[PATCH] [X86] Improve a dag-combine that handles a vector extract -> zext sequence.

[Michael Kuperstein]

Closed by commit rL223360 (authored by @mkuper).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6501

Files:
  llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
  llvm/trunk/test/CodeGen/X86/gather-addresses.ll
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