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

[Filipe Cabecinhas]

Fixed bugs pointed by Benjamin Kramer.

http://reviews.llvm.org/D3561

Files:
  a.c
  add-packed.ll
  insertps.after.s
  insertps.before.s
  insertps.ll
  lib/Transforms/InstCombine/InstCombineSelect.cpp
  test/Transforms/InstCombine/select.ll
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