* class.c (find_final_overrider_data): Add `candidates'.
	(dfs_find_final_overrider): Don't issue error messages
	prematurely.
	(find_final_overrider): Issue error messages here.
	(build_base_field): Don't warn about amgibuous direct bases here.
	(warn_about_ambiguous_direct_bases): New function.
	(layout_class_type): Use it.

From-SVN: r41224