[jdk16] RFR: 8257621: JFR StringPool misses cached items across consecutive recordings [v2]

[Markus Grönlund]

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

Markus Grönlund has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 10 additional commits since the last revision:

 - merge
 - whitespace
 - rephrasing
 - javadoc update
 - Reintroduce string pool generation
 - fallback on incorrect generation is the EventWriter notification
 - whitespace
 - rephrasing
 - javadoc update
 - Reintroduce string pool generation

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

Changes:
  - all: https://git.openjdk.java.net/jdk16/pull/18/files
  - new: https://git.openjdk.java.net/jdk16/pull/18/files/909abfc6..d7fbab06

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk16&pr=18&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk16&pr=18&range=00-01

  Stats: 881 lines in 32 files changed: 674 ins; 112 del; 95 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