[jdk21u-dev] RFR: 8322142: JFR: Periodic tasks aren't orphaned between recordings

[Anton Hägerstrand]

Backport to fix https://bugs.openjdk.org/browse/JDK-8322142 for jdk21. 

First time commiting to openjdk, so please pardon if this is the wrong approach to the PR. I followed instructions in https://wiki.openjdk.org/display/JDKUpdates/How+to+contribute+or+backport+a+fix - not sure if those are still valid for 21.

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

Commit messages:
 - Backport 1551928502c8ed96350e7b4f1316ea35587407fe

Changes: https://git.openjdk.org/jdk21u-dev/pull/203/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=203&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322142
  Stats: 7 lines in 1 file changed: 0 ins; 4 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/203.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/203/head:pull/203

PR: https://git.openjdk.org/jdk21u-dev/pull/203