6885 - starting on floating-point instructions

I spent some time deciding on the instructions. x87 is a stack ISA, so
not a good fit for the rest of SubX. So we use SSE instead. They operate
on 32-bit floats, which seems like a good fit.

SSE has a bunch of instructions for operating on up to 4 floats at once.
We'll ignore all that and just focus on so-called scalar instructions.

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