8031359: Invocable.getInterface() works incorrectly if interface has default methods
Reviewed-by: attila, hannesw
[jdk.internal.dynalink.beans.CallerSensitiveDynamicMethod Object java.security.AccessController.doPrivileged(PrivilegedAction)]
[jdk.internal.dynalink.beans.SimpleDynamicMethod String java.lang.String.valueOf(char)]