Request for review(S): 6822263 G1: JVMTI heap iteration fails

[Igor Veresov]

JVMTI reachable objects iteration functions use a call to object_iterate() to 
clean the marking bits of the objects (it uses marking bits to track the 
vertices of the object graph that it visits). The semantics of the 
object_iterate() include iteration over the perm gen. However G1 doesn't do 
that. The fix is to include the perm gen objects in the iterable set.

Webrev: http://cr.openjdk.java.net/~iveresov/6822263/webrev.00

Testing: Affected nsk tests