[PATCH] Fix fmul combines with constant splat vectors

[Matt Arsenault]

Fixes things like fmul x, 2 -> fadd x, x

Mips test changes to pass with the new output, which I assume are correct.

http://reviews.llvm.org/D4676

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/Mips/msa/arithmetic_float.ll
  test/CodeGen/X86/fmul-combines.ll
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