RFR: 8209125: ZGC: Clean up ZServiceabilityCounters

[Thomas Schatzl]

Hi,

On Wed, 2018-08-08 at 14:14 +0200, Per Liden wrote:
> This patch does some minor cleanups and adjust some names in 
> ZServiceabilityCounters.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8209125
> Webrev: http://cr.openjdk.java.net/~pliden/8209125/webrev.0
> 

  looks good.

Thomas