[jdk23u] RFR: 8340230: Tests crash: assert(is_in_encoding_range || k->is_interface() || k->is_abstract()) failed: sanity

[Martin Doerr]

Backport of [JDK-8340230](https://bugs.openjdk.org/browse/JDK-8340230). Needs manual integration because [JDK-8340012](https://bugs.openjdk.org/browse/JDK-8340012) is not in jdk23u.
Using DecodeN without CompressedOops or DecodeNKlass without CompressedClassPointers can cause errors.

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Commit messages:
 - Backport 3895b8fc0b2c6d187080dba6fe08297adad4a480

Changes: https://git.openjdk.org/jdk23u/pull/104/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=104&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340230
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk23u/pull/104.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/104/head:pull/104

PR: https://git.openjdk.org/jdk23u/pull/104