[Nestmates] RFR: 8191114: [Nestmates] Update access control exception handling and other features per final JVMS proposal

[David Holmes]

Bug: https://bugs.openjdk.java.net/browse/JDK-8191114
webrev: http://cr.openjdk.java.net/~dholmes/8191114/webrev/

The final proposed changes to the JVMS have been discussed by the EG and 
it is time to bring everything into line with the proposed spec.

The main changes are:
- Process for determining the nest-host has changed, specifically:
   - same package check is done first**
   - IncompatibleClassChangeError is thrown instead of IllegalAccessError
- A self-reference is permitted in the NestMembers array
- A self-reference is not permitted in the NestHost attribute
- Duplicate entries are permitted in the NestMembers array
- Invokeinterface use for private interface methods is permitted 
regardless of classfile version (so no exception saying "you should use 
invokespecial").

** This had a disruptive impact on the tests as using Object and 
Object[] as "bad hosts" now hit the "not in same package" error instead 
of the intended error - so these had to be replaced with a new class 
defined in the same (unnamed) package.

All tests were updated to match the changes, and new tests added where 
needed. In particular:
- nest membership tests had to add the bad "SelfHost" case
- reflection API getNestMembers() had to allow for and test, 
self-reference and duplicate entries [the spec is being clarified under 
JDK-8193408]

Some minor cleanups:
- src/hotspot/share/classfile/stackMapFrame.hpp
   - reverted leftover copyright year change (file is not modified from 
mainline version)
-  src/hotspot/share/classfile/verifier.cpp
   - reverted leftover layout and whitespace changes (file is not 
modified from mainline version)

Thanks,
David