Don't decrement the count of threads in Processes::ThreadExit.  It is decremented by the root thread when the thread object is removed from the table.  Doing it in both places results in it being decremented twice.
Don't decrement the count of threads in Processes::ThreadExit.  It is decremented by the root thread when the thread object
is removed from the table.  Doing it in both places results in it being decremented twice.

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