[PATCH] Fix a broadcast related regression on the vector shuffle lowering.

[Filipe Cabecinhas]

Added Chandler suggested fixes.

http://reviews.llvm.org/D5745

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-shuffle-256-v4.ll
  test/CodeGen/X86/vector-shuffle-256-v8.ll
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