[PATCH] R600/SI: Fix selection failure on scalar_to_vector

[Matt Arsenault]

There seem to be only 2 places that produce these, and it's kind of tricky to hit them.
Also fixes failure to bitcast between v2i16 and f32, although this for some reason wasn't 
actually broken in the  simple bitcast testcase, but did in the scalar_to_vector one.

http://reviews.llvm.org/D4098

Files:
  lib/Target/R600/AMDGPUISelDAGToDAG.cpp
  lib/Target/R600/SIInstructions.td
  test/CodeGen/R600/bitcast.ll
  test/CodeGen/R600/scalar_to_vector.ll
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