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…hich is useful for wasm2js. also add a wasm2js mode in the fuzzer
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This is useful for wasm2js, as we don't emit traps for OOB loads etc. like wasm (like we don't trap on bad float-to-int, as it's too hard in JS, and it's undefined behavior in C anyhow). It may also help general fuzzing, as those traps may make other interesting patterns less likely.
Also add more wasm2js support in the fuzzer, which includes using this no-OOB option.