RFR: Merge jdk20

[Jesper Wilhelmsson]

Forwardport JDK 20 -> JDK 21

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Commit messages:
 - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20
 - 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
 - 8293717: Objective view of ObjectView
 - 8293734: Improve BMP image handling
 - ... and 5 more: https://git.openjdk.org/jdk/compare/8b70c432...77fb81ec

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk&pr=12085&range=00.0
 - jdk20: https://webrevs.openjdk.org/?repo=jdk&pr=12085&range=00.1

Changes: https://git.openjdk.org/jdk/pull/12085/files
  Stats: 564 lines in 27 files changed: 332 ins; 117 del; 115 mod
  Patch: https://git.openjdk.org/jdk/pull/12085.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12085/head:pull/12085

PR: https://git.openjdk.org/jdk/pull/12085