RFR: Merge openjdk/jdk21u-dev:master [v2]

[William Kemper]

> Merges tag jdk-21.0.6+1

William Kemper has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 134 commits:

 - Merge branch 'master' into merge-jdk-21.0.6+1
 - 8342701: [PPC64] TestOSRLotsOfLocals.java crashes
   
   Backport-of: 3bba0f3dc8faf83a3aadcd704ae2ae4967e6daa4
 - 8334560: [PPC64]: postalloc_expand_java_dynamic_call_sched does not copy all fields
   
   Backport-of: 13dce296fc3924b269757ce1279c57afe18faeeb
 - 8328379: Convert URLDragTest.html applet test to main
   
   Backport-of: fbeac98c84078a566c572abeba07c49e94bbf26b
 - 8195675: Call to insertText with single character from custom Input Method ignored
   
   Backport-of: b8f2ec9091f9f7e5f4611991d04dd8aa113b94fd
 - 8325506: Ensure randomness is only read from provided SecureRandom object
   
   Reviewed-by: lucy
   Backport-of: b87d9cf2c9d905c15f4c957d42361b1a72974edf
 - 8320673: PageFormat/CustomPaper.java has no Pass/Fail buttons; multiple instructions
   
   Backport-of: 0ff2deab5d6b8228ddfed9ae08820d2adf2330c2
 - 8322754: click JComboBox when dialog about to close causes IllegalComponentStateException
   
   Backport-of: e44276989fc6358065412be7567d0141c84f1282
 - 8225220: When the Tab Policy is checked,the scroll button direction displayed incorrectly.
   
   Backport-of: ed5b8c3a7bb6de27ab5050db494b08d5e5dd1c44
 - 8316428: G1: Nmethod count statistics only count last code root set iterated
   
   Backport-of: fab372d3a23b17f64ae4306e28bdb0bc511f4912
 - ... and 124 more: https://git.openjdk.org/shenandoah-jdk21u/compare/d03588ad...2e0f974f

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

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/134/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=134&range=01
  Stats: 15747 lines in 326 files changed: 9595 ins; 5010 del; 1142 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/134.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/134/head:pull/134

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/134