[jdk21u-dev] RFR: 8332154: Memory leak in SynchronousQueue

[Martin Doerr]

Clean backport of [JDK-8332154](https://bugs.openjdk.org/browse/JDK-8332154).

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Commit messages:
 - Backport b78613b6813a85662fb2af2004d0b68002fe471d

Changes: https://git.openjdk.org/jdk21u-dev/pull/687/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=687&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332154
  Stats: 99 lines in 4 files changed: 98 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/687.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/687/head:pull/687

PR: https://git.openjdk.org/jdk21u-dev/pull/687