RFR: 8352066: JVM.commit() and JVM.flush() exhibit race conditions against JFR epochs [v2]

[Markus Grönlund]

> Greetings,
> 
> This change set removes some race conditions involving JFR epochs. For details, please see the JIRA issue.
> 
> Testing: jdk_jfr, TestChunkIntegrity testing
> 
> Thanks
> Markus

Markus Grönlund has updated the pull request incrementally with one additional commit since the last revision:

  restore checkpoint manager on_rotation

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/24061/files
  - new: https://git.openjdk.org/jdk/pull/24061/files/2f4d1827..349045dc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24061&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24061&range=00-01

  Stats: 5 lines in 2 files changed: 0 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/24061.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24061/head:pull/24061

PR: https://git.openjdk.org/jdk/pull/24061