SkJumper: allow the compiler to generate FMAs

Today we use mad() to get FMAs where possible.
-ffp-contract=fast lets the compiler generate them if it spots an opportunity.

It looks like it's found a mix of FMAs and FMSs.

I will follow up by seeing if we can relax the use of mad().
Quick experiments say no, but less quick experiments may say otherwise.

Change-Id: I5228811cfbf11cccc0d715672a464fd1e1cea3b0
Reviewed-on: https://skia-review.googlesource.com/9136
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>

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