[X86] isNegatibleForFree - allow pre-legalized FMA negation
As long as the FMA operation is legal (which we can proxy for the FMA3/FMA4 variants as well), we don't have to wait for the LegalOperations stage.
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As long as the FMA operation is legal (which we can proxy for the FMA3/FMA4 variants as well), we don't have to wait for the LegalOperations stage.