Generate wasm-reduce scripts when given a seed too (#2843)
Generate wasm-reduce scripts when given a seed too (#2843)

Currently the fuzzer only generate a script for wasm-reduce only when it
first discovers a case and doesn't do that when a seed is given. But
when you get a bug report with a seed or you want to reproduce the
situation, is still helpful if the fuzzer generates a reduce script for
you.
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