[PATCH] Fold selects when the non-selected elements are undef from shufflevectors

[Filipe Cabecinhas]

More fixes pointed by Benjamin Kramer.
Make the test-cases more strict w.r. to shufflevector mask.

http://reviews.llvm.org/D3561

Files:
  lib/Transforms/InstCombine/InstCombineSelect.cpp
  test/Transforms/InstCombine/select.ll
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