[jdk17u-dev] RFR: 8291650: Add delay to ClassUnloadEventTest before exiting to give time for JVM to send all events before VMDeath [v3]

[Andrew Dinn]

> Backport of JDK-8291650

Andrew Dinn has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 10 additional commits since the last revision:

 - Merge master
 - 8291650: Add delay to ClassUnloadEventTest before exiting to give time for JVM to send all events before VMDeath
   
   Reviewed-by: sspitsyn, amenkov
 - Merge branch 'JDK-8256811' into JDK-8290908
 - correct type
 - Merge branch 'JDK-8256811' into JDK-8290908
 - remove unnecessary cast change
 - Merge branch 'JDK-8256811' into JDK-8290908
 - Merge branch 'master' into JDK-8256811
 - 8290908: misc tests fail: assert(!thread->owns_locks()) failed: must release all locks when leaving VM
   
   Reviewed-by: cjplummer, amenkov
 - Backport 54854d9300479c22c416fd9d2fdb5c29fc1884bc

-------------

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/824/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/824/files/acaa655f..0ecc0427

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=824&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=824&range=01-02

  Stats: 42661 lines in 431 files changed: 39277 ins; 1743 del; 1641 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/824.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/824/head:pull/824

PR: https://git.openjdk.org/jdk17u-dev/pull/824