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
 - 8299862: OfAddress setter should disallow heap segments
 - 8299849: Revert JDK-8294461: wrong effectively final determination by javac
 - 8299227: host `exif.org` not found in link in doc comment
 - 8299715: IR test: VectorGatherScatterTest.java fails with SVE randomly
 - 8294744: AArch64: applications/kitchensink/Kitchensink.java crashed: assert(oopDesc::is_oop(obj)) failed: not an oop
 - 8299733: AArch64: "unexpected literal addressing mode" assertion failure with -XX:+PrintC1Statistics
 - 8299693: Change to Xcode12.4+1.1 devkit for building on macOS at Oracle

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk&pr=11952&range=00.0
 - jdk20: https://webrevs.openjdk.org/?repo=jdk&pr=11952&range=00.1

Changes: https://git.openjdk.org/jdk/pull/11952/files
  Stats: 98 lines in 16 files changed: 53 ins; 19 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/11952.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11952/head:pull/11952

PR: https://git.openjdk.org/jdk/pull/11952