RFR: 8222000: JFR: Process start event

[Erik Gahlin]

Hi

Could I have review of a JFR event that is emitted when a process is 
started from Java.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8222000

Webrev:
http://cr.openjdk.java.net/~egahlin/8222000/

Testing:
tier1,tier2 + jdk/jdk/jfr

Thanks
Erik