[jdk21u] Integrated: 8312434: SPECjvm2008/xml.transform with CDS fails with "can't seal package nu.xom"

[Calvin Cheung]

Clean backport.

Passed tier1 testing.

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Commit messages:
 - Backport 9f4a9fe488be7ce43f6719c54df25a1fabd8696a

Changes: https://git.openjdk.org/jdk21u/pull/322/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=322&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312434
  Stats: 143 lines in 6 files changed: 94 ins; 32 del; 17 mod
  Patch: https://git.openjdk.org/jdk21u/pull/322.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/322/head:pull/322

PR: https://git.openjdk.org/jdk21u/pull/322