[NFC] [DAGCombiner] Remove unnecessary negation in visitFNEG
In visitFNEG of DAGCombiner, the folding of (fneg (fsub c, x)) is redundant since getNegatedExpression already handles it.
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In visitFNEG of DAGCombiner, the folding of (fneg (fsub c, x)) is redundant since getNegatedExpression already handles it.