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Fix bug around handling of failures in spawnWorker
calls
#87
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Fixes dart-lang/tools#776
If a worker process fails to spawn, we will now complete the work attempt that caused the process to spawn with that failure, instead of never completing the attempt at all, causing a hang, and also leaking the async exception as an unhandled exception.
We could add retry logic in the future if we want, but it is probably unlikely that trying again will work. This way the actual failure should be reliably surfaced though.