dcubed [Thu, 23 Jun 2011 20:31:43 -0700] rev 10228
7043987: 3/3 JVMTI FollowReferences is slow
Summary: VM_HeapWalkOperation::doit() should only reset mark bits when necessary.
Reviewed-by: dsamersoff, ysr, dholmes, dcubed
Contributed-by: ashok.srinivasa.murthy@oracle.com