[jdk21u-dev] RFR: 8297692: Avoid sending per-region GCPhaseParallel JFR events in G1ScanCollectionSetRegionClosure [v2]

[Roman Marchenko]

> This is backport of "[JDK-8297692](https://bugs.openjdk.org/browse/JDK-8297692) Avoid sending per-region GCPhaseParallel JFR events in G1ScanCollectionSetRegionClosure"
> 
> Several conflicts related to different class names were resolved in `src/hotspot/share/gc/g1/g1YoungCollector.cpp`.

Roman Marchenko has updated the pull request incrementally with one additional commit since the last revision:

  Fixing debug builds

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/1775/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/1775/files/59451302..bd6a67d8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1775&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1775&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1775.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1775/head:pull/1775

PR: https://git.openjdk.org/jdk21u-dev/pull/1775