Teach the DAG combiner to turn chains of FADDs (x+x+x+x+...) into FMULs by...
Teach the DAG combiner to turn chains of FADDs (x+x+x+x+...) into FMULs by constants. This is only enabled in unsafe FP math mode, since it does not preserve rounding effects for all such constants. llvm-svn: 162956
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