RFR: 8339197: GenShen: Adding Generation and Evacuation Information JFR Logging [v3]

[Satyen Subramaniam]

> Adding `ShenandoahEvacInfo` event and modifying existing logging for Concurrent Reset and Final Roots events to include generation for Generational Shenandoah GC.

Satyen Subramaniam has updated the pull request incrementally with one additional commit since the last revision:

  Removing extra ShenandoahEvacInfo, using size_t instead of uint

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Changes:
  - all: https://git.openjdk.org/shenandoah/pull/489/files
  - new: https://git.openjdk.org/shenandoah/pull/489/files/e434531c..ad94b8fd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah&pr=489&range=02
 - incr: https://webrevs.openjdk.org/?repo=shenandoah&pr=489&range=01-02

  Stats: 42 lines in 5 files changed: 0 ins; 20 del; 22 mod
  Patch: https://git.openjdk.org/shenandoah/pull/489.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/489/head:pull/489

PR: https://git.openjdk.org/shenandoah/pull/489