RFR: 8215175: Inconsistencies in JFR event metadata

[Erik Gahlin]

Hi,

Could I have review of this fix to the event metadata.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8215175

Webrev:
http://cr.openjdk.java.net/~egahlin/8215175/

Thanks
Erik