[jdk21u-dev] RFR: 8319955: Improve dependencies removal during class unloading

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

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Commit messages:
 - Backport fbe19378c38decaff221f6570d1b78bb801a5e5d

Changes: https://git.openjdk.org/jdk21u-dev/pull/456/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=456&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319955
  Stats: 42 lines in 2 files changed: 38 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/456.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/456/head:pull/456

PR: https://git.openjdk.org/jdk21u-dev/pull/456