[jdk21u-dev] RFR: 8347564: ZGC: Crash in DependencyContext::clean_unloading_dependents

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle.

I had to resolve javaClasses.h|cpp.
Might be clean after resolve.

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Commit messages:
 - resolves
 - Backport 14136f8b1106137317393bc2ab0a2db0d212f8d8

Changes: https://git.openjdk.org/jdk21u-dev/pull/1996/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1996&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347564
  Stats: 167 lines in 13 files changed: 8 ins; 143 del; 16 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1996.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1996/head:pull/1996

PR: https://git.openjdk.org/jdk21u-dev/pull/1996