Complain about -D option if debugging is disabled.
BUG #2521: AIX: dont die when CPU is dynamically added to system.
PATCH #1279: Modified patch from Mohan for coredump after calling
free with a bad regex.
Merge branch 'V5-4-patches' into V5-5-patches

* V5-4-patches:
  BUG #2521: AIX: dont die when CPU is dynamically added to system.
Merge branch 'V5-5-patches' into V5-6-patches

* V5-5-patches:
  BUG #2521: AIX: dont die when CPU is dynamically added to system.