I don't think doing this at HGraph construction time is the right approach.
strongest reason for that is that the fused multiply-add depends on
instructions' representations -- which are not yet final at graph
time, they are inferred later (to some extent right now, to much bigger
when https://chromiumcodereview.appspot.com/10837165/ lands, and to much,
bigger extent in the medium-term future).
One way around this would be a separate Hydrogen phase, but that idea has
After discussing this with Sven and Ulan, we agreed that the best approach
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