Don't create a separate copy of virtual bases for the
	CLASSTYPE_VBASECLASSES list.
	* cp-tree.h (CLASSTYPE_VBASECLASSES): Change documentation.
	(BINFO_FOR_VBASE): Remove.
	(CANONICAL_BINFO): Adjust.
	(binfo_for_vbase): New function.
	* class.c (build_vbase_pointer_fields): Use binfo_for_vbase
	instead of BINFO_FOR_VBASE.
	(build_vbase_pointer): Likewise.
	(build_secondary_vtable): Likewise.
	(dfs_mark_primary_bases): Likewise.
	(mark_primary_bases): Likewise.
	(layout_nonempty_base_or_field): Likewise.
	(dfs_set_offset_for_shared_vbases): Likewise.
	(dfs_set_offset_for_unshared_vbases): Likewise.
	(layout_virtual_bases): Likewise.  Adjust for changes to the
	CLASSTYPE_VBASECLASSES list.
	(dump_class_hierarchy_r): Use binfo_for_vbase
	instead of BINFO_FOR_VBASE.
	(dump_class_hierarchy): Likewise.
	(finish_vtbls): Likewise.
	(build_vtbl_initializer): Adjust for changes to the
	CLASSTYPE_VBASECLASSES list.
	(build_vbase_offset_vtbl_entries): Use binfo_for_vbase.
	* decl.c (finish_destructor_body): Adjust for changes to the
	CLASSTYPE_VBASECLASSES list.
	* init.c (sort_base_init): Use binfo_for_vbase.
	(construct_virtual_bases): Adjust for changes to the
	CLASSTYPE_VBASECLASSES list.
	(expand_member_init): Use binfo_for_vbase.
	(build_vbase_delete):  Adjust for changes to the
	CLASSTYPE_VBASECLASSES list.
	* method.c (do_build_copy_constructor): Likewise.
	* rtti.c (get_base_offset): Use binfo_for_vbase.
	(expand_class_desc): Remove #if 0'd code.
	* search.c (struct vbase_info): Remove vbase_types.
	(get_base_distance):  Use binfo_for_vbase.
	(lookup_field_queue_p): Use CANONICAL_BINFO.
	(get_shared_vbase_if_not_primary): Use binfo_for_vbase.
	(get_pure_virtuals): Adjust for changes to the
	CLASSTYPE_VBASECLASSES list.
	(dfs_find_vbases): Use binfo_for_vbase.
	(dfs_init_vbase_pointers): Likewise.
	(init_vbase_pointers): Don't initialize vi.vbase_types.
	(virtual_context): Use binfo_for_vbase.
	(fixup_all_virtual_upcast_offsets): Adjust for changes to the
	CLASSTYPE_VBASECLASSES list.
	(expand_indirect_vtbls_init): Simplify.
	(dfs_get_vbase_types): Don't replicate virtual bases.
	(find_vbase_instance): Use binfo_for_vbase.
	(binfo_for_vbase): New function.
	* typeck.c (get_delta_difference): Use binfo_for_vbase.

From-SVN: r34040