RFR: 8252224: Convert ZValue to use alias templates

[Kim Barrett]

> On Aug 25, 2020, at 3:03 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this patch to get rid of some code duplication in the ZValue files by using alias templates.
> 
> https://cr.openjdk.java.net/~stefank/8252224/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8252224
> 
> Thanks,
> StefanK

Looks good.