SynthDef and UGen further optimization (even JIT compilation?)

[smoge]

@jamshark70

I think this is both untrue (a * b + c optimization → MulAdd is reliable, it’s not necessary to write MulAdd directly), and not relevant to SynthDef variants.

Oh, sorry. But at a certain point in the past, UnaryOpUGen and BinaryOpUgen were special cases, right? I forget.