[SelectionDAG] Fix NaN regression in fma dag-combine. (#146592) After 901e1390c9778a191256335d37802bc631c2d183 (#127770), the DAG combine would transform `fma(x, 0.0, 1.0)` into `1.0` if `-fp-contract=fast` was enabled, in addition to when 'x' is marked nnan/ninf. It's only valid in the latter case, not the former, so delete the extra condition.
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