MFCr350610:

MFCr350610:
  exit1: postpone clearing P_TRACED flag until the proctree lock is acquired

  In case of the process being debugged. The P_TRACED is cleared very early,
  which would make procdesc_close() not calling proc_clear_orphan().
  That would result in the debugged process can not be able to collect
  status of the process with process descriptor.

  Reviewed by:  markj, kib
  Tested by:    pho