RFR: 8138888: Remove ExtendedOopClosure::apply_to_weak_ref_discovered_field

[Stefan Johansson]

>> I was a bit unclear. I want to push them together, but as separate changesets.
>>
>> I created sub-task for the log change and moved the webrev.
>> Sub-task: https://bugs.openjdk.java.net/browse/JDK-8179550
>> Webrev: http://cr.openjdk.java.net/~sjohanss/8179550/hotspot.00/
>>
>> Still need a second reviewer for the changes though.
>>
>> Thanks,
>> Stefan
> OK.  Looks good.
>
Thanks Kim,
StefanJ