RFR: 8247214: ZGC: ZUncommit initialization should use precious logging

[Per Liden]

Looks good!

/Per

On 6/9/20 2:35 PM, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this trivial patch to convert the ZUncommit initialization 
> logging to use precious logging.
> 
> https://cr.openjdk.java.net/~stefank/8247214/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8247214
> 
> Thanks,
> StefanK