[PATCH] Fix interference caused by fmul 2, x -> fadd x, x combine

[Matt Arsenault]

Add more tests I forgot to attach

http://reviews.llvm.org/D4678

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/Mips/msa/arithmetic_float.ll
  test/CodeGen/R600/fmul.ll
  test/CodeGen/R600/llvm.sin.ll
  test/CodeGen/X86/fmul-combines.ll
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