RFR: Merge jdk20

Wed Feb 1 20:10:46 UTC 2023

Forwardport JDK 20 -> JDK 21

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Commit messages:
 - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20
 - 8298377: JfrVframeStream causes deadlocks in ZGC
 - 8299891: JMX ObjectInputFilter additional classes needed

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/jdk/pull/12374/files
  Stats: 158 lines in 2 files changed: 145 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/12374.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12374/head:pull/12374

PR: https://git.openjdk.org/jdk/pull/12374