[jdk21u-dev] RFR: 8348402: PerfDataManager stalls shutdown for 1ms

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle.

src/hotspot/share/runtime/objectMonitor.cpp
Resolved as comments in context are different.

src/hotspot/share/runtime/perfData.hpp
Copyright

src/hotspot/share/runtime/synchronizer.cpp
Resolved #include.

-------------

Commit messages:
 - backport 305bbdae7fe40e33cf2baa100c134bd85ecaa553

Changes: https://git.openjdk.org/jdk21u-dev/pull/2058/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2058&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348402
  Stats: 56 lines in 5 files changed: 34 ins; 4 del; 18 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2058.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2058/head:pull/2058

PR: https://git.openjdk.org/jdk21u-dev/pull/2058