[jdk21u] RFR: 8313081: MonitoringSupport_lock should be unconditionally initialized after 8304074 [v2]

[Paul Hohensee]

> Clean backport to fix an issue with 8304074. All management tests pass, including the updated ThreadAllocatedMemory.java.

Paul Hohensee has updated the pull request incrementally with two additional commits since the last revision:

 - 8313081: Trigger GHA
 - 8313081: Trigger GHA

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Changes:
  - all: https://git.openjdk.org/jdk21u/pull/20/files
  - new: https://git.openjdk.org/jdk21u/pull/20/files/68c79668..268bb66b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u&pr=20&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u&pr=20&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 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