Fuzzing: Compare wasm2js to the interpreter (#3026)

Comparing to the interpreter, and not just wasm2js to itself (which we've
done on the same file before and after opts) ensures wasm2js has the right
semantics.

To do this, we need to make sure the wasm doesn't contain things where
wasm2js semantics diverge from normal wasm, which includes:

* Legalize so that there are no i64 exports.
* Remove operations JS can't handle with full precision, like i64 -> f32.
* Force all loads/stores to be 1-byte, as unexpectedly-unaligned operations
  fail in wasm2js.

This also requires ignoring subnormals when comparing between JS
VMs and the interpreter.

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