[PATCH] [X86] Fix bug in new build_vector v4x32 lowering

[Michael Kuperstein]

Hi andreadb, qcolombet,

The new build_vector lowering misses a case where:

1) A single extracted element is used twice.
2) The lower of the two non-zero indexes should be preserved, and the higher should be used for the dest mask.

This causes a crash, since the source value for the insertps ends-up uninitialized.

http://reviews.llvm.org/D6377

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/sse41.ll
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