[lworld] RFR: 8372113: [lworld] Fix various issues with TypeAryPtr and TypeAryKlassPtr

Fri Nov 21 10:29:46 UTC 2025

Hi,

This PR fixes various issues with `TypeAryPtr` and `TypeAryKlassPtr`. It starts with me trying to tighten the properties (`flat`, `null_free`, etc) of these classes, then fixing all the revealed issues until there are no crashes or wrong results left.

Please take a look and leave your reviews, thanks a lot.

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Commit messages:
 - Tighten the type system around array properties and fix related issues

Changes: https://git.openjdk.org/valhalla/pull/1755/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1755&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372113
  Stats: 448 lines in 18 files changed: 166 ins; 144 del; 138 mod
  Patch: https://git.openjdk.org/valhalla/pull/1755.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1755/head:pull/1755

PR: https://git.openjdk.org/valhalla/pull/1755