[jdk17u] RFR: 8273505: runtime/cds/appcds/loaderConstraints/DynamicLoaderConstraintsTest.java#default-cl crashed with SIGSEGV in MetaspaceShared::link_shared_classes

[Harold Seigel]

Please review this JDK-17u backport of the fix for JDK-8273505.  The patch applied cleanly except that  MetaspaceShared::link_shared_classes() is called MetaspaceShared::link_and_cleanup_shared_classes() in JDK-17u.  The backport was tested with Mach5 tiers 1-2 on Linux, Mac OS, and Windows, and Mach5 tiers 3-5 on Linux x64.

Thanks, Harold

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Commit messages:
 - Backport a67f0f9dc04200c22db05e277346f24d31306b53

Changes: https://git.openjdk.java.net/jdk17u/pull/187/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=187&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273505
  Stats: 15 lines in 2 files changed: 5 ins; 7 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/187.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/187/head:pull/187

PR: https://git.openjdk.java.net/jdk17u/pull/187