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
 - 8299705: JCov coverage runs depend on jdk_symbols
 - 8299740: CaptureCallState is missing @Preview annotation
 - 8299528: IR test: TestEor3AArch64.java fails on aarch64
 - 8298525: javadoc crashes with "UnsupportedOperationException: Not yet implemented" in SeeTaglet.inherit
 - 8299561: VaList.empty() doesn't return a list associated with the global scope

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk&pr=11889&range=00.0
 - jdk20: https://webrevs.openjdk.org/?repo=jdk&pr=11889&range=00.1

Changes: https://git.openjdk.org/jdk/pull/11889/files
  Stats: 54 lines in 10 files changed: 39 ins; 0 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/11889.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11889/head:pull/11889

PR: https://git.openjdk.org/jdk/pull/11889