[PATCH] DAGCombiner: don't duplicate (fmul x, c) when folding fneg if fneg is free

[Matt Arsenault]

In http://reviews.llvm.org/D10277#184262, @escha wrote:

> I think the only in-tree target that uses isFNegFree is R600; should I try to come up with an R600 test case? I've never worked on that backend.


Yes, it should be effected. It should be easy to copy one of the tests for this (probably fmul.ll is simplest)


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