re PR c++/11617 (g++ does not report missing member functions)

re PR c++/11617 (g++ does not report missing member functions)

cp:
	PR c++/11617
	* cp-tree.h (qualified_name_lookup_error): Declare.
	* pt.c (tsubst_qualified_id): Use qualified_name_lookup_error for
	errors.
	(tsubst_expr) <DECL_STMT case>: Likewise.
	(tsubst_copy_and_build) <COMPONENT_REF case>: Likewise.
	* semantics.c (qualified_name_lookup_error): New, broken out of ...
	(finish_id_expression): ... here. Use it.
testsuite:
	PR c++/11617
	* g++.dg/template/lookup2.C: New test.
	* g++.dg/template/memclass1.C: Remove instantiated from error.

From-SVN: r69790