Create JFR flame graphs on Java 9+

[oehme]

No description provided.

[javabrett]

It's probably already been noticed that as well as the lib jars being renamed, all the packages have been relocated from com.jrockit.mc to com.oracle.jmc. Not sure which of the following options is preferred (all refer to oehme/jfr-flame-graph):

• Pre-shadow to a common package-name and check/hope for API stability. Produce a JDK8 and JDK9 all version of that lib with the correct dependency. Clearly the JFR recording format has changed.
• Split out the source and compile separately for JDK8 and JFK9, and produce different -all versions. Downside is that two source-trees have to be independently maintained.

[javabrett]

Actually JDK9 is EOL but I imagine this applies to JDK10 also.

[oehme]

Fixed by 2db305f. Note that I'm still investigating an issue where Java 11 delivers way less CPU samples than earlier versions. Memory samples on the other hand are fine. This may be a JDK or OS bug, I'm not sure yet.