RFR (S): 8202686: Missing test case for 8200167 - final Object methods

[David Holmes]

webrev: http://cr.openjdk.java.net/~dholmes/8202686/webrev/
bug: https://bugs.openjdk.java.net/browse/JDK-8202686

JDK-8200167 added additional checks to ensure receiver typechecks were 
in place where needed for invokespecial invocations. There was one 
variation missing in the test: invoking a final Object method via an 
interface reference. This is potentially different to a non-final Object 
method because the finality means the method is treated as non-virtual 
and so activates different call paths in the logic.

No unexpected behaviour was found but the test case is added for 
completeness (which is significant when we adapt this invokeinterface 
testing for the nestmates work (JEP 181).

There were also a couple of positive MH invocations missing from the 
test so they were added for completeness as well.

Thanks,
David