RFR(XL): 8199712: Flight Recorder

[Erik Gahlin]

Greetings,

Could I have a review of 8199712: Flight Recorder

As mentioned in the preview [1] the tracing backend has been removed. 
Event metadata has been consolidated into a single XML file and event 
classes are now generated by GenerateJfrFiles.java.

Tests have been run on Linux-x64, Windows-x64 and MaxOSX-x64.

For details about the feature, see the JEP:
https://bugs.openjdk.java.net/browse/JDK-8193393

Webrev:
http://cr.openjdk.java.net/~egahlin/8199712.0/

Bug:
https://bugs.openjdk.java.net/browse/JDK-8199712

[1] 
http://mail.openjdk.java.net/pipermail/hotspot-dev/2018-April/031359.html

Thanks
Erik and Markus