RFR: Merge openjdk/jdk:master

[William Kemper]

Merges tag jdk-22+15

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Commit messages:
 - 6228794: java.text.ChoiceFormat pattern behavior is not well documented.
 - 8314226: Series of colon-style fallthrough switch cases with guards compiled incorrectly
 - 8316087: Test SignedLoggerFinderTest.java is still failing
 - 8315934: RISC-V: Disable conservative fences per vendor
 - 8316021: Serial: Remove unused Generation::post_compact
 - 8316050: Use hexadecimal encoding in MemorySegment::toString
 - 8314612: TestUnorderedReduction.java fails with -XX:MaxVectorSize=32 and -XX:+AlignVector
 - 8311207: Cleanup for Optimization for UUID.toString
 - 8315898: Open source swing JMenu tests
 - 8315761: Open source few swing JList and JMenuBar tests
 - ... and 88 more: https://git.openjdk.org/shenandoah/compare/024133b0...ce93d27f

The webrev contains the conflicts with master:
 - merge conflicts: https://webrevs.openjdk.org/?repo=shenandoah&pr=323&range=00.conflicts

Changes: https://git.openjdk.org/shenandoah/pull/323/files
  Stats: 24498 lines in 1388 files changed: 12058 ins; 8350 del; 4090 mod
  Patch: https://git.openjdk.org/shenandoah/pull/323.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/323/head:pull/323

PR: https://git.openjdk.org/shenandoah/pull/323