[jdk16] RFR: 8257621: JFR StringPool misses cached items across consecutive recordings [v3]

[Markus Grönlund]

> Greetings,
> 
> this change fixes problems with the StringPool as it relates to chunk rotations.
> 
> Thanks
> Markus

Markus Grönlund has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.

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

Changes:
  - all: https://git.openjdk.java.net/jdk16/pull/18/files
  - new: https://git.openjdk.java.net/jdk16/pull/18/files/d7fbab06..edd4278d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk16&pr=18&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk16&pr=18&range=01-02

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/18.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/18/head:pull/18

PR: https://git.openjdk.java.net/jdk16/pull/18