RFR: 8213617: JFR should record the PID of the recorded process

[Erik Gahlin]

Hi,

Could I have a review of an enhancement that will add the JVM pid to the 
JVM Information event.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8213617

Webrev:
http://cr.openjdk.java.net/~egahlin/8213617/

Thanks
Erik