RFR: ZGC: Remove abbreviations in JFR events

[Per Liden]

Looks good!

/Per

On 2018-05-31 10:35, Stefan Karlsson wrote:
> Hi all,
> 
> The following test fails if events have the words stat or alloc in names:
> test/jdk/jdk/jfr/event/metadata/TestEventMetadata.java
> 
> I've updated the ZGC JFR events to adhere to these strict conventions, 
> so that we pass this tests.
> 
> http://cr.openjdk.java.net/~stefank/zgc/zJfrMetadata/webrev.01/
> 
> StefanK