Fix rir inlining promises #1231
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…iler `function() invisible(return(5))` would trip the bytecode verifier since we'd emit ret_ in the inlined promise in the middle of the `invisible` call sequence, leaving stuff on the stack... For now, track when inlining promises and emit return_ in those cases (since return_ does a longjump and resets stack). Ideally we would just not emit any code after finding a call to return, but this would be more involved to change.
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