ipa-devirt.c (odr_types_equivalent_p): Expect constants than const decls in TREE_VALU...

ipa-devirt.c (odr_types_equivalent_p): Expect constants than const decls in TREE_VALUE of enum.

	* ipa-devirt.c (odr_types_equivalent_p): Expect constants
	than const decls in TREE_VALUE of enum.
	(dump_type_inheritance_graph): Improve duplicate dumping.
	(free_enum_values): New.
	(build_type_inheritance_graph): Use it.
	* tree.c (free_lang_data_in_type): Free TYPE_VALUES of enums
	which are not main variants or not ODR types.
	(verify_type_variant): Expect variants to have no TYPE_VALUES.

From-SVN: r265875