RFR: 8217855: ZGC: Clean up ZReferenceProcessor

[Stefan Karlsson]

Looks good.

StefanK

On 2019-01-28 09:59, Per Liden wrote:
> Various structural and naming cleanups in ZReferenceProcessor.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8217855
> Webrev: http://cr.openjdk.java.net/~pliden/8217855/webrev.0
>
> /Per