RFR: 8309862: Unsafe list operations in JfrStringPool

[Markus Grönlund]

Greetings,

please help review this fix to unsafe list operations in the JfrStringPool.

Details are in the JIRA issues.

Testing: jdk_jfr, stress testing.

Thanks
Markus

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Commit messages:
 - 8309862

Changes: https://git.openjdk.org/jdk/pull/14426/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14426&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309862
  Stats: 74 lines in 5 files changed: 44 ins; 13 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/14426.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14426/head:pull/14426

PR: https://git.openjdk.org/jdk/pull/14426