Please review fix for 7197269: NPG: FollowReferences has no ClassLoader -> Class link to follow

[Coleen Phillmore]

Summary: restore java/lang/ClassLoader.addClass() call for compatibility 
with JVMTI

With Permgen elimination this classes vector is unnecessary for GC but 
having it maintains compatibility with JVMTI FollowReferences.

open webrev at http://cr.openjdk.java.net/~coleenp/7197269/
bug link at http://bugs.sun.com/view_bug.do?bug_id=7197269

Tested against daCapo.

Thanks,
Coleen