RFR: 8304844 JFR: Missing disk parameter in ActiveRecording event

[Erik Gahlin]

Could I have a review of change that adds the disk parameter to the ActiveRecording event.

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/13171/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13171&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304844
  Stats: 9 lines in 3 files changed: 6 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/13171.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13171/head:pull/13171

PR: https://git.openjdk.org/jdk/pull/13171