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	predicate.
	* tinfo.cc (__user_type_info::do_upcast): Fix bug with diamond
	shaped heirarchy.
	(__vmi_class_type_info::__do_upcast): Fix bug with NULL pointer to
	diamond shaped heirarchy. Add early out for mixed diamond and
	duplicate shaped heirarchy.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@34163 138bc75d-0d04-0410-961f-82ee72b054a4