[jdk17u-dev] RFR: 8256811: Delayed/missed jdwp class unloading events

[Andrew Dinn]

Backport of patch to fix class unloading event notification.

This backport was originally developed by @zhengyu123 and involved some minor changes to the original patch.

n.b. the original patch required a follow up fix (cf JDK-8290908) which also needs backporting after this has been included.

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Commit messages:
 - Backport 54854d9300479c22c416fd9d2fdb5c29fc1884bc

Changes: https://git.openjdk.org/jdk17u-dev/pull/635/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=635&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8256811
  Stats: 495 lines in 12 files changed: 254 ins; 147 del; 94 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/635.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/635/head:pull/635

PR: https://git.openjdk.org/jdk17u-dev/pull/635