re PR c++/11345 (ICE in build_base_path)

	PR c++/11345
	* search.c (lookup_base_r): Remove is_non_public and
	within_current_scope parameters.  Remove other dead code.
	(lookup_base): Adjust call to lookup_base_r.
	(adjust_result_of_qualified_name_lookup): Improve comment.
	* semantics.c (finish_call_expr): Use maybe_dummy_object.

From-SVN: r69020