RFR: Merge jdk19

[Jesper Wilhelmsson]

Forwardport JDK 19 -> JDK 20

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Commit messages:
 - Merge
 - 8288988: ProblemList serviceability/jvmti/vthread/ContStackDepthTest/ContStackDepthTest.java in -Xcomp mode
 - 8288846: misc tests fail "assert(ms < 1000) failed: Un-interruptable sleep, short time use only"
 - 8288840: StructureViolationException should not link to fork method
 - 8287982: Concurrent implicit attach from native threads crashes VM
 - 8288529: broken link in java.xml

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk&pr=9251&range=00.0
 - jdk19: https://webrevs.openjdk.org/?repo=jdk&pr=9251&range=00.1

Changes: https://git.openjdk.org/jdk/pull/9251/files
  Stats: 434 lines in 12 files changed: 379 ins; 22 del; 33 mod
  Patch: https://git.openjdk.org/jdk/pull/9251.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9251/head:pull/9251

PR: https://git.openjdk.org/jdk/pull/9251