RFR (S): 8211065: Private method check in linkResolver is incorrect

[David Holmes]

webrev: http://cr.openjdk.java.net/~dholmes/8211065/webrev/
bug: https://bugs.openjdk.java.net/browse/JDK-8211065

I had added a check, as part of the nestmates works, to ensure that the 
selected and resolved methods, in the case of private methods, were the 
same. That check was both in the wrong place and ill-formed.

The check has now been deleted.

A nestmate test that incorrectly expected NoSuchMethodError when a 
private method in a subclass was deleted (but still called) has been 
updated to expect the superclass method to be invoked.

A new test was added that previously highlighted an incorrect assertion 
within the check. Now it serves as a non-nestmate case of deleting a 
subclass method.

This will be backported to 11 as well.

Thanks,
David