Remove the quick stop path after convert_unit_to_func

Now I'm not exactly sure why I needed to check `stop_worker_p` after
`mjit_copy_cache_from_main_thread` of `convert_unit_to_func`
in 4161674b2fbea6bdd01783ac5d3b39d88db22972.
If it's for avoiding deadlock under `in_gc` condition, we should keep it.

However, if it's not the case and it's just for retrying accidental
compilation failure or just to avoid `MJIT_ATOMIC_SET` and
`compact_all_jit_code`, I think this quick stop path is not mandatory.

Because this path is somewhat problematic in my upcoming fix in
mjit_worker, let me try to remove this first and see how CI goes.

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