[PATCH] Combine fmul vector FP constants when unsafe math is allowed

[Sanjay Patel]

Hi arsenm,

This is an extension of the change made with r215820:
http://llvm.org/viewvc/llvm-project?view=revision&revision=215820

That patch allowed combining of splatted vector FP constants that are multiplied. 

This patch allows combining non-uniform vector FP constants too by relaxing the check on the type of vector. I've also tried to canonicalize a vector fmul in the same way that we already do for scalars - if only one operand of the fmul is a constant, make it operand 1. Otherwise, we miss potential folds.

http://reviews.llvm.org/D5254

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