RFR(s): 8236766: Remove un-used oops do and drain list in VM thread.

[David Holmes]

Looks good!

Thanks,
David

On 10/01/2020 7:35 pm, Robbin Ehn wrote:
> Hi all, please review.
> 
> We have removed all oops and oops do from the VM operations.
> We can now remove the oops do on VM op base class, oops do on VM queue 
> and the drain list.
> 
> Note that I also removed the unused VMOperationQueue::verify_queue.
> 
> Issue:
> https://bugs.openjdk.java.net/browse/JDK-8236766
> 
> Changeset:
> http://cr.openjdk.java.net/~rehn/8236766/v1/webrev/index.html
> 
> Passes t1-3.
> 
> Thanks, Robbin