RFR(M): 8033552: Fix missing missing volatile specifiers in CAS operations in GC code

[Kim Barrett]

> On Sep 13, 2016, at 11:28 AM, Erik Österlund <erik.osterlund at oracle.com> wrote:
>> However, a proceedural issue: These new CRs have been marked as
>> subtasks of the main CR.  I'm not sure what happens when the main CR
>> is resolved (by pushing something like the updated change set) but
>> subtasks remain open?
> 
> Hmm, good point. I made them bugs originally but they were changed to subtasks.
> Would it be best to changed them back to bugs maybe?

Turning them back into bugs seems like the simplest thing to do.