RFR: Merge openjdk/jdk:master

[William Kemper]

Merges upstream tag jdk-21+6.

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

Commit messages:
 - Merge openjdk/jdk:master
 - 8292635: Run ArchivedEnumTest.java in jdk tier testing
 - Merge
 - 8300275: SegmentScope.isAccessibleBy returning incorrect values
 - 8300195: Fall-through issue occurs when using record pattern in switch statements
 - 8295723: security/infra/wycheproof/RunWycheproof.java fails with Assertion Error
 - 8295687: Better BMP bounds
 - 8293742: Better Banking of Sounds
 - 8293554: Enhanced DH Key Exchanges
 - 8287411: Enhance DTLS Performance
 - ... and 117 more: https://git.openjdk.org/shenandoah/compare/800c0c88...5857315e

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=shenandoah&pr=205&range=00.0
 - openjdk/jdk:master: https://webrevs.openjdk.org/?repo=shenandoah&pr=205&range=00.1

Changes: https://git.openjdk.org/shenandoah/pull/205/files
  Stats: 10920 lines in 794 files changed: 5817 ins; 1573 del; 3530 mod
  Patch: https://git.openjdk.org/shenandoah/pull/205.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah pull/205/head:pull/205

PR: https://git.openjdk.org/shenandoah/pull/205