search.c (lookup_field_r): Set the TREE_TYPE of an ambiguous lookup to error_mark_nod...

search.c (lookup_field_r): Set the TREE_TYPE of an ambiguous lookup to error_mark_node here.

	* search.c (lookup_field_r): Set the TREE_TYPE of an ambiguous
	lookup to error_mark_node here.
	(lookup_member): Revise documentation.  Add comments.  Don't set
	the TREE_TYPE to error_mark_node here, and don't build up an extra
	TREE_LIST for ambiguous lookups.
	(setup_class_bindings): Adjust accordingly.
	(push_class_decls): Revise out-of-date comments.

From-SVN: r26754