[jdk21] RFR: 8311040: JFR: RecordedThread::getOSThreadId() should return -1 if thread is virtual

[Markus Grönlund]

8311040: JFR: RecordedThread::getOSThreadId() should return -1 if thread is virtual

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Commit messages:
 - Backport 9905f7582270634eb19f7d9cb67210a174da9a85

Changes: https://git.openjdk.org/jdk21/pull/135/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=135&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311040
  Stats: 65 lines in 6 files changed: 23 ins; 9 del; 33 mod
  Patch: https://git.openjdk.org/jdk21/pull/135.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/135/head:pull/135

PR: https://git.openjdk.org/jdk21/pull/135