re PR c++/48593 (Wrong return type when applying address operator to inherited, template dependend member, using a typedef)

	PR c++/48593
	* pt.c (tsubst_qualified_id): Check PTRMEM_OK_P.
	* tree.c (build_qualified_name): Set PTRMEM_OK_P.
	* semantics.c (finish_parenthesized_expr): Clear PTRMEM_OK_P on
	SCOPE_REF, too.
	* cp-tree.h (PTRMEM_OK_P): Apply to SCOPE_REF, too.
	(QUALIFIED_NAME_IS_TEMPLATE): Switch to lang flag 1.

From-SVN: r175765