fuzz_opt.py improvements (#2822)

    Don't run wasm2c2wasm on large wasm files, as it can OOM the VM.
    I've seen this happen on a single wasm on multiple engines, so it's not
    a specific engine bug. Sticking to below-average wasm sizes seems ok.

    That change means that we check if a vm can run on a per-wasm basis.
    That required some refactoring as it means we may be able to run on
    the "before" wasm but not the "after" one, or vice versa.

    Fix a tiny nondeterminism issue with iterating on a set().

    Some tiny docs improvements to the error shown when a bug is found.

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