RFR+RFA [11u]: 8215175: Inconsistencies in JFR event metadata

[Langer, Christoph]

Hi,

and another one...

May I please get reviews for the downport of 8215175 to jdk11u.

Bug: https://bugs.openjdk.java.net/browse/JDK-8215175
Original Change: http://hg.openjdk.java.net/jdk/jdk/rev/c8b2a408628b
Backport Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8215175.jdk11u/

The patch did not apply cleanly.

src/hotspot/share/jfr/metadata/metadata.xml had some fuzz but change is effectively the same as the original one.
src/jdk.jfr/share/classes/jdk/jfr/internal/Utils.java also failed. I copied the changed methods from the code that can be found in jdk/jdk currently.
src/jdk.jfr/share/classes/jdk/jfr/internal/tool/PrettyWriter.java does not exist because of the missing jfr tool. So patch could obviously not be applied to that file.

I'll run the full test suite before pushing.

Best regards
Christoph