RFR: 8334765: JFR: Log chunk waste

[Erik Gahlin]

Could I have a review of PR that adds logging of chunk waste.

Testing: jdk/jdk/jfr

Thanks
Erik

-------------

Commit messages:
 - Updates
 - Initial

Changes: https://git.openjdk.org/jdk/pull/19845/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19845&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334765
  Stats: 32 lines in 2 files changed: 29 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/19845.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19845/head:pull/19845

PR: https://git.openjdk.org/jdk/pull/19845