[PATCH] Convert a vselect into a concat_vector if possible

[Filipe Cabecinhas]

Hi nadav, delena, grosbach,

If both vector args to vselect are concat_vectors and the condition is
constant and picks half a vector from each argument, convert the vselect
into a concat_vectors.

Added tests.

http://reviews.llvm.org/D3916

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