[PATCH] [X86 DAG] Lower vselects with a constant condition as blend+imm if possible

[Filipe Cabecinhas]

Addresses Andrea's comments about the BUILD_VECTORtoBlendMask function.

http://reviews.llvm.org/D3752

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/X86/avx-blend.ll
  test/CodeGen/X86/avx2.ll
  test/CodeGen/X86/blend-msb.ll
  test/CodeGen/X86/sse41-blend.ll
  test/CodeGen/X86/sse41.ll
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