[PATCH] Convert a vselect into a concat_vector if possible

[Filipe Cabecinhas]

Moved the transform to DAGCombine.cpp, since it's generic, not X86 specific.

Also added the asserts Nadav requested and addressed the bug pointed out by Hal.

Nadav: Merging the loops would make for a big, complicated mess, instead
of two small, simple loops. I'd prefer to keep them separated, if you
don't mind.

http://reviews.llvm.org/D3916

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/Generic/select.ll
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