RFR: 8241881: ZGC: Add tests for JFR events

[Per Liden]

Thanks Stefan!

/Per

On 3/31/20 4:32 PM, Stefan Karlsson wrote:
> Looks good.
> 
> StefanK
> 
> On 2020-03-30 22:38, Per Liden wrote:
>> Add tests for the newly added ZGC-specific JFR events that we intend 
>> to make non-experimental as part of JEP 377. These events are:
>>
>> ZAllocationStall
>> ZPageAllocation
>> ZPageCacheFlush
>> ZRelocationSet
>> ZRelocationSetGroup
>> ZUncommit
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8241881
>> Webrev: http://cr.openjdk.java.net/~pliden/8241881/webrev.0
>>
>> /Per