8023368: Instance __proto__ property should exist and be writable.
Reviewed-by: attila, hannesw
R1.run() invoked
R2.run() invoked
r3.run() invoked
r1.class != r2.class: true
r2.class == r3.class: true
Got exception: java.lang.UnsupportedOperationException
Got exception: java.lang.UnsupportedOperationException
(new ExtendsList).size() = 0
(new ExtendsList(){}).size() = 0