[jdk17u-dev] RFR: 8274753: ZGC: SEGV in MetaspaceShared::link_shared_classes

[Thomas Stuefe]

Hi all,

not a clean backport. I had to fix up classLoaderData.cpp a bit because `SystemDictionaryShared::handle_class_unloading(ik);` does not yet exist in jdk17 and I did not want to bring the dependent cleanup change into jdk17 too (among other things because Oracle seems not to have done it either in their closed backport as far as I can glean from the JBS tags).

Tested in SAP nightlies for about a week now.

Thanks!

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Commit messages:
 - necessary changes for jdk17
 - Backport 110e38ded8e09361f24c582c770d35f5cfdabf82

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/118/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=118&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274753
  Stats: 40 lines in 3 files changed: 31 ins; 1 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/118.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/118/head:pull/118

PR: https://git.openjdk.java.net/jdk17u-dev/pull/118