RFR: JDK-8005845 (JEP 149) Fully Concurrent ClassLoading - VM Changes

[David Holmes]

As described here:

https://blogs.oracle.com/dholmes/entry/parallel_classloading_revisited_fully_concurrent

and discussed here:

http://mail.openjdk.java.net/pipermail/core-libs-dev/2012-December/012658.html

FullyConcurrent classloaders allow for parallel-defineClass to occur. 
These are the VM changes to support that:

http://cr.openjdk.java.net/~dholmes/8005845/webrev/

Quite simply we allow access to the fullyConcurrent field in 
java.lang.ClassLoader and if it is fullyConcurrent then we allow a 
parallel-defineClass to occur.

In a JDK without the ClassLoader change this is all a no-op.

Thanks,
David