Add PrintClassLoaderDataGraphAtExit to print the detailed CLD graph

Add -XX:+PrintClassLoaderDataGraphAtExit to print the complete ClassLoaderData for debugging purpose:


ClassLoaderData(0x00007ff17432b670)
 - name 'platform'
 - holder WeakHandle: 0x00000007fef56678
 - class loader 0x7ff17432b828
 - metaspace 0x7ff17468a0b0
 - unloading false
 - class mirror holder false
 - modified oops true
 - keep alive 0
 - claim strong
 - handles 43
 - dependency count 0
 - klasses {java.sql.SQLFeatureNotSupportedException,java.sql.SQLNonTransientException,java.sql.SQLException,sun.util.resources.provider.NonBaseLocaleDataMetaInfo,org.ietf.jgss.GSSException,javax.sql.DataSource,java.sql.Wrapper,javax.sql.CommonDataSource,java.sql.Time,java.sql.Date,java.sql.Timestamp,sun.util.resources.cldr.provider.CLDRLocaleDataMetaInfo, }
 - packages 0x7ff17432bc20
 - module 0x7ff17432c520
 - unnamed module 0x7ff17432c3d0
 - dictionary 0x7ff17432c470
 - deallocate list 0x7ff0a4023bd0