Do not unref debug handle to avoid debug process stuck#2778
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For a simple javascript file:
Run
node debug a.jsto launch debug process. Press firstcand the program outputs> debug. After that, presscagain the process just gets stuck and has no response so we have to kill it.This is because debug handle has been unrefed. Once the program is finished, the event loop will be exited and the debug process will be stuck when debug sends commend again. We shouldn't unref the debug handle because even the script is finished, we can still send more debug command such as
restart.Fixes#1788.