[InstCombine] C / -X --> -C / X
We already do this in DAGCombiner, but it should also be good to eliminate the fsub use in IR. This is similar to rL325648. llvm-svn: 325649
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We already do this in DAGCombiner, but it should also be good to eliminate the fsub use in IR. This is similar to rL325648. llvm-svn: 325649