tree.c (check_qualified_type): New fn.

tree.c (check_qualified_type): New fn.

        * tree.c (check_qualified_type): New fn.
        (get_qualified_type): Use it.  If type already has the desired
        quals, just return it.
        * tree.h: Declare it.
        * cp/tree.c (build_exception_variant): Use it.

From-SVN: r78376