RFR: 8203028: Simplify reference processing in light of JDK-8175797

[Kim Barrett]

> On May 15, 2018, at 11:01 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
>> The next field does get updated, just not via any bespoke mechanism.
>> It's now treated as an ordinary oop-containing field, just like
>> queue.
>> See the InstanceRefKlass::update_nonstatic_oop_maps change.
> 
>  that was what I was missing. Looks good.
> 
> Thanks,
>  Thomas

Thanks.