cp-tree.h (get_dynamic_cast_base_type): Rename to ...

cp-tree.h (get_dynamic_cast_base_type): Rename to ...

	* cp-tree.h (get_dynamic_cast_base_type): Rename to ...
	(dcast_base_hint): ... here.
	* rtti.c (build_dynamic_cast_1): Use dcast_base_hint.
	* search.c (struct dcast_data_s): New.
	(dynamic_cast_base_recurse): Remove. Replace with ...
	(dfs_dcast_hint_pre, dfs_dcast_base_post): ... these. New.
	(get_dynamic_cast_base_type): Rename to ...
	(dcast_base_hint): ... here.  Use dfs_walk_once_accessible.
	(accessible_r): Remove.
	(dfs_accessible_post): New, broken out of accessible_r.
	(accessible_p): Use dfs_walk_once_accessible.
	(dfs_walk_once_accessible_r): New. From accessible_r.
	(dfs_walk_once_accessible): New. From acessible_p.

From-SVN: r88884