RFR: Merge openjdk/jdk21u:master [v3]

[William Kemper]

> Merges tag jdk-21.0.9+4

William Kemper has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 28 additional commits since the last revision:

 - Merge tag 'jdk-21.0.9+4' into merge-jdk-21.0.9+4
   
   Added tag jdk-21.0.9+4 for changeset 3949aae8cd88
 - 8325397: sun/java2d/Disposer/TestDisposerRace.java fails in linux-aarch64
   
   Backport-of: e0c46d589b12aa644e12e4a4c9e84e035f7cf98d
 - 8353126: Open source events tests batch1
   
   Backport-of: cd5a43a98030a534babb01cfc4521e7e9bc89b91
 - 8352860: Open source events tests batch0
   
   Backport-of: d4d18350f367a18813d0d418169e852c1530418e
 - 8348135: Fix couple of problem listing entries in test/hotspot/jtreg/ProblemList-Virtual.txt
   
   Backport-of: 16a1d0a7ff04acf70573d303141a41dadca08f7a
 - 8352677: Opensource JMenu tests - series2
   
   Backport-of: cfc648bd17cc79b1c3e6f69d3559749e937261b2
 - 8185429: [macos] After a modal dialog is closed, no window becomes active
   
   Backport-of: 3a26bbcebc2f7d11b172f2b16192a3adefeb8111
 - 8357285: JSR166 Test case testShutdownNow_delayedTasks failed
   
   Backport-of: 6a07820483bcf3e9d7df27ee496db43675f1c002
 - 8341370: Test java/awt/Frame/ShapeNotSetSometimes/ShapeNotSetSometimes.java fails intermittently on macOS-aarch64
   
   Reviewed-by: mbaesken
   Backport-of: 84a67e83e3f4fcb6be6802d12b0788850a3845b5
 - 8346255: java/lang/management/ThreadMXBean/VirtualThreadDeadlocks.java finds no deadlock
   
   Backport-of: 9ebb5d42d43a743cf3a5197c7dabe46ac8120474
 - ... and 18 more: https://git.openjdk.org/shenandoah-jdk21u/compare/4fe18d25...c9496fe8

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

Changes:
  - all: https://git.openjdk.org/shenandoah-jdk21u/pull/215/files
  - new: https://git.openjdk.org/shenandoah-jdk21u/pull/215/files/3949aae8..c9496fe8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=215&range=02
 - incr: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=215&range=01-02

  Stats: 29904 lines in 289 files changed: 24522 ins; 3576 del; 1806 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/215.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/215/head:pull/215

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/215