RFR: 8205405: ZGC: Decouple JFR type registration

[Per Liden]

Thanks Stefan!

/Per

On 06/21/2018 11:42 AM, Stefan Karlsson wrote:
> Looks good.
> 
> StefanK
> 
> On 2018-06-20 11:27, Per Liden wrote:
>> When JDK-8205053 is completed, it becomes possible to register 
>> subsystem-specific JFR types from outside of JFR. The code that 
>> registers ZGC's two types is currently embedded into JFR itself. This 
>> code can now be moved into ZGC itself.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8205405
>> Webrev: http://cr.openjdk.java.net/~pliden/8205405/webrev.0
>>
>> Testing: Manually generated and verified a test recording
>>
>> /Per