While investigating 8156137 I noticed that InstanceKlass::_previous_version_count goes negative unexpectedly.  There seems to be an accounting problem.
            
- relates to
- 
                    JDK-8165246 [REDO] InstanceKlass::_previous_version_count goes negative -           
- Closed
 
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- 
                    JDK-8156137 SIGSEGV in ReceiverTypeData::clean_weak_klass_links -           
- Closed
 
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 P3
  P3