RFR: Merge openjdk/jdk:master [v2]

[William Kemper]

> Merges tag jdk-21+23

William Kemper has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 283 commits:

 - Merge tag 'jdk-21+23' into merge-jdk-21-23
   
   Added tag jdk-21+23 for changeset 6d4782bc
 - Use static assert to validate card offset encoding mask
   
   Reviewed-by: ysr
 - Assert that region usage accounting is only accessed in generational mode
   
   Reviewed-by: kdnilsen
 - Increase card offset mask
   
   Reviewed-by: kdnilsen
 - Merge openjdk/jdk:master
 - Remove passing tests from ProblemList.txt
   
   Reviewed-by: ysr, shade
 - Alphabetize includes
   
   Reviewed-by: shade
 - Use distinct "end of cycle" message for each Shenandoah pause
   
   Reviewed-by: kdnilsen, ysr
 - Remove the remaining unclean upstream difference
   
   Reviewed-by: kdnilsen
 - Merge openjdk/jdk:master
   
   Reviewed-by: shade
 - ... and 273 more: https://git.openjdk.org/shenandoah/compare/6d4782bc...3253f2b1

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Changes: https://git.openjdk.org/shenandoah/pull/282/files
 Webrev: https://webrevs.openjdk.org/?repo=shenandoah&pr=282&range=01
  Stats: 19758 lines in 211 files changed: 17921 ins; 893 del; 944 mod
  Patch: https://git.openjdk.org/shenandoah/pull/282.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/282/head:pull/282

PR: https://git.openjdk.org/shenandoah/pull/282