[jdk21u] RFR: 8313081: MonitoringSupport_lock should be unconditionally initialized after 8304074

Thu Jul 27 18:05:14 UTC 2023

Clean backport to fix an issue with 8304074. All management tests pass.

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Commit messages:
 - Backport a9d21c61fb12a11e18c6bb8aa903e5a8e42473f1

Changes: https://git.openjdk.org/jdk21u/pull/20/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=20&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313081
  Stats: 17 lines in 3 files changed: 12 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u/pull/20.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/20/head:pull/20

PR: https://git.openjdk.org/jdk21u/pull/20