[jdk21u-dev] RFR: 8311823: JFR: Uninitialized EventEmitter::_thread_id field

[Elif Aslan]

Clean backport. Testing is in progress

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Commit messages:
 - Backport 9688ec2d0d9fd830d993454ea093b68b0f85ebe7

Changes: https://git.openjdk.org/jdk21u-dev/pull/417/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=417&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311823
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/417.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/417/head:pull/417

PR: https://git.openjdk.org/jdk21u-dev/pull/417