better handling of float ops in wasm2asm (#1427)

* explicitly handle binary float operations in processFunctionBody

We weren't handling them before, but it wasn't obvious.  Make the (non-)
handling of them explicit in the code.  We'll add handlers for them
shortly.

* add handling for simple binary float operations

min, max, and copysign will require more sophisticated handling.

* add handling for float comparisons

* move float min/max handling to the correct place

It was previously grouped with the i32 ops.

* handle float promotion and demotion

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