RFR: 8370242: JFR: Clear event reference eagerly when using EventStream

[Erik Gahlin]

Could I have review of a change that reduce the live set when using event streaming?

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Remove patch.txt
 - Initial

Changes: https://git.openjdk.org/jdk/pull/27906/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27906&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370242
  Stats: 11 lines in 2 files changed: 10 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27906.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27906/head:pull/27906

PR: https://git.openjdk.org/jdk/pull/27906