8078473: javac diamond finder crashes when used to build java.base module.
Reviewed-by: mcimadamore
T8078473.java:15:14: compiler.warn.diamond.redundant.args.1: T8078473.C<Q,Q>, T8078473.C<java.lang.Object,java.lang.Object>
T8078473.java:16:14: compiler.warn.diamond.redundant.args.1: T8078473.C<Q,Q>, T8078473.C<java.lang.Object,java.lang.Object>
2 warnings