decl.c (check_tag_decl): Make sure a typedef for an anonymous class-type introduces at least a type-name.

cp/
        * decl.c (check_tag_decl): Make sure a typedef for an anonymous
        class-type introduces at least a type-name.

testsuite/
        * g++.old-deja/g++.other/decl9.C: New test.

From-SVN: r39781