Put RTTI entries at negative offsets in new ABI.

Put RTTI entries at negative offsets in new ABI.

	* class.c (dfs_build_vbase_offset_vtbl_entries): Put the first
	vbase offset at index -3, not -1.
	(build_vtabe_offset_vtbl_entries): Use unmarked_vtable_pathp, not
	dfs_vtable_path_unmarked_real_bases_queue_p to walk bases.
	(dfs_build_vcall_offset_vtbl_entries): Don't use skip_rtti_stuff.
	(build_rtti_vtbl_entries): New function.
	(set_rtti_entry): Remove.
	(build_primary_vtable): Don't use it.
	(build_secondary_vtable): Likewise.
	(start_vtable): Remove.
	(first_vfun_index): New function.
	(set_vindex): Likewise.
	(add_virtual_function): Don't call start_vtable.  Do call
	set_vindex.
	(set_primary_base): Rename parameter.
	(determine_primary_base): Likewise.
	(num_vfun_entries): Don't use skip_rtti_stuff.
	(num_extra_vtbl_entries): Include RTTI information.
	(build_vtbl_initializer): Use build_rtti_vtbl_entries.
	(skip_rtti_stuff): Remove.
	(dfs_modify_vtables): Don't use it.
	(modify_all_vtables): Don't use start_vtable.  Do use set_vindex.
	(layout_nonempty_base_or_field): Update size handling.
	(create_vtable_ptr): Tweak.
	(layout_class_type): Adjust parameter names.
	(finish_struct_1): Simplify.
	* cp-tree.h (CLASSTYPE_VSIZE): Tweak documentation.
	(skip_rtti_stuff): Remove.
	(first_vfun_index): New function.
	(dfs_vtable_path_unmarked_real_bases_queue_p): Remove.
	(dfs_vtable_path_marked_real_bases_queue_p): Remove.
	(marked_vtable_pathp): Declare.
	(unmarked_vtable_pathp): Likewise.
	* error.c (dump_expr): Use first_vfun_index to calculate vtable
	offsets.
	* rtti.c (build_headof): Look for RTTI at negative offsets.
	(get_tinfo_decl_dynamic): Likewise.
	(tinfo_base_init): Don't take the address of the TINFO_VTABLE_DECL
	here.
	(create_pseudo_type_info): Do it here instead.  Adjust so that
	vptr points at first virtual function.
	* search.c (marked_vtable_pathp): Make it global.
	(unmarked_vtable_pathp): Likewise.
	(dfs_vtable_path_unmarked_real_bases_queue_p): Remove.
	(dfs_vtable_path_marked_real_bases_queue_p): Likewise.
	(dfs_get_pure_virtuals): Don't use skip_rtti_stuff.
	(get_pure_virtuals): Likewise.
	(expand_upcast_fixups): Likewise.
	* tree.c (debug_binfo): Likewise.
	* tinfo.cc (__dynamic_cast): Look for vtable_prefix at appropriate
	negative offset.

From-SVN: r32787