The nestmate changes update the JVMS and require an increment in the class file version number. The tasks here are based on those previously listed for the change to v53: JDK-8148651.

We also look at the changes needed to javac to add a new "release".

Filed in tools->javac though it will cover a range of activities across tools, build and the VM.

This is a valhalla clone of the mainline subtask: JDK-8187296

After investigating the state of javac's --release flag it is considered out of scope to update this, and we will instead simply update the -source/-target support to trigger use of classfile version 54, and the new code generation approaches used by nestmates.