TemplateTable::invokevfinal_helper currently has own code instead of using TemplateTable::prepare_invoke on PPC64. It also loads the number of parameters from the ConstMethod. This works, but other platforms take it from the ResolvedMethodEntry. This should better get cleaned up.
TemplateInterpreter::invoke_return_entry_table_for should support _fast_invokevfinal which is only used by PPC64. (AIX has no CDS support.)