* Makefile.in (ipa-devirt.o): Add dependency on diagnostic.h
	* ipa-devirt.c: Include diganostic.h
	(odr_type_d): Add types and types_set.
	(hash_type_name): Work for types with vtables during LTO.
	(odr_hasher::remove): Fix comment; destroy types_set.
	(add_type_duplicate): New function,
	(get_odr_type): Use it.
	(dump_type_inheritance_graph): Dump type duplicates.
	* ipa.c (symtab_remove_unreachable_nodes): Build type inheritance
	graph.
	* tree.c (types_same_for_odr): Give exact answers on types with
	virtual tables.

From-SVN: r202258