[jdk21u-dev] RFR: 8327501: Common ForkJoinPool prevents class unloading in some cases [v4]

[Aleksey Shipilev]

> The change is stabilizing in mainline, but it looks simple, so we start testing it for JDK 21 pickup here.
> 
> Additional testing:
>  - [ ] Linux x86_64 server fastdebug, `all`
>  - [ ] Linux AArch64 server fastdebug, `all`

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Backport 28216aa971ea65938117107542152abd532a5384
 - Backport 53c4714aab2e072ba18631875dcaa3b2d5d22243

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Changes: https://git.openjdk.org/jdk21u-dev/pull/338/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=338&range=03
  Stats: 11 lines in 2 files changed: 8 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/338.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/338/head:pull/338

PR: https://git.openjdk.org/jdk21u-dev/pull/338