Integrated: Merge jdk16

[Jesper Wilhelmsson]

Forwardport JDK 16 -> JDK 17

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Commit messages:
 - Merge
 - 8258484: AIX build fails in Harfbuzz with XLC 16.01.0000.0006
 - 8039278: console.sh failed Automatically with exit code 1
 - 8258972: unexpected compilation error with generic sealed interface
 - 8259227: C2 crashes with SIGFPE due to a division that floats above its zero check
 - 8258657: Doc build is broken by use of new language features
 - 8250903: jdk/jfr/javaagent/TestLoadedAgent.java fails with Mismatch in TestEvent count

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.java.net/?repo=jdk&pr=1994&range=00.0
 - jdk16: https://webrevs.openjdk.java.net/?repo=jdk&pr=1994&range=00.1

Changes: https://git.openjdk.java.net/jdk/pull/1994/files
  Stats: 198 lines in 15 files changed: 147 ins; 31 del; 20 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1994.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1994/head:pull/1994

PR: https://git.openjdk.java.net/jdk/pull/1994