re PR c++/16273 (Memory exhausted when using nested classes and virtual functions)

re PR c++/16273 (Memory exhausted when using nested classes and virtual functions)

	PR c++/16273
	* class.c (count_depth_data): New type.
	(dfs_depth_post): New function.
	(dfs_depth_q): Likewise.
	(find_final_overrider_data_s): Change type of vpath.
	Add vpath_list.
	(dfs_find_final_overrider_1): New function.
	(dfs_find_final_overrider): Use it.
	(dfs_find_final_overrider_q): Adjust use of vpath.
	(dfs_find_final_overrider_post): Likewise.
	(find_final_overrider): Use dfs_depth.  Allocate and deallocate
	vpath_list.

From-SVN: r85886