RFR: 8339197: GenShen: Adding Generation and Evacuation Information JFR Logging

[Kelvin Nilsen]

This pull request contains a backport of commit 662d146d from the openjdk/shenandoah repository.

The commit being backported was authored by Satyen Subramaniam on 4 Sep 2024 and was reviewed by Kelvin Nilsen,
William Kemper and Y. Srinivas Ramakrishna.

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Commit messages:
 - Backport 662d146d52dd77d13cfe705a4a4959c5fb2fb5a1

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/81/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=81&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339197
  Stats: 323 lines in 10 files changed: 312 ins; 5 del; 6 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/81.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/81/head:pull/81

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/81