[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]

> Fixed some more issues...this one is perfect, I swear! :)
>
> Stephen

I lied, there was a stupid bug actually (misplaced return statement).
Also, I started using CHECK-LABEL already (this patch will be applied
after that with whatever the final name CHECK-LABEL gets, or it will
be taken off if that doesn't go through...)

Stephen
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