[PATCH] Allow FMAs in safe math mode in some cases when one operand of the fmul is either exactly 0.0 or exactly 1.0.

[Stephen Lin]

> Since there's a lot of new code paths through this function, I will
> add more test coverage to make sure we don't have any false positives
> and to help prevent regression in the future; in the meantime please
> (Hal or anyone else) review the new source changes, if you get a
> chance.
>
> Thanks,
> Stephen

I updated the patch; if anyone gets a chance, please review.

Stephen
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