[PATCH] Lower certain build_vectors to insertps instructions

[Filipe Cabecinhas]

Fix the undef bug pointed by Elena.

Thanks for the detailed report, I finally understood the bug's cause :-)

  Filipe

http://reviews.llvm.org/D3521

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/sse41.ll
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