RFR: Merge openjdk/jdk:master

[William Kemper]

Merges tag jdk-23+21

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Commit messages:
 - 8331222: Malformed text in the jpackage doc page
 - 8331427: Rename confusingly named ArraysSupport.signedHashCode
 - 8331212: Error recovery for broken switch expressions could be improved
 - 8331142: Add test for number of loader threads in BasicDirectoryModel
 - 8330969: scalability issue with loaded JVMTI agent
 - 8331393: AArch64: u32 _partial_subtype_ctr loaded/stored as 64
 - 8318682: SA decoding of scalar replaced objects is broken
 - 8331207: Misleading example in DateFormat#parse docs
 - 8329223: Parallel: Parallel GC resizes heap even if -Xms = -Xmx
 - 8331252: C2: MergeStores: handle negative shift values
 - ... and 58 more: https://git.openjdk.org/shenandoah/compare/87e864bf...e833bfc8

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/shenandoah/pull/428/files
  Stats: 15145 lines in 1355 files changed: 4410 ins; 7219 del; 3516 mod
  Patch: https://git.openjdk.org/shenandoah/pull/428.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/428/head:pull/428

PR: https://git.openjdk.org/shenandoah/pull/428