[lworld] RFR: 8372113: [lworld] Fix various issues with TypeAryPtr and TypeAryKlassPtr [v3]

[Quan Anh Mai]

> 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.

Quan Anh Mai has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - whitespace
 - fix more issues
 - Merge branch 'lworld' into AryKlassPtrfactory
 - Fix test failures
 - Tighten the type system around array properties and fix related issues

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Changes: https://git.openjdk.org/valhalla/pull/1755/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1755&range=02
  Stats: 486 lines in 20 files changed: 193 ins; 130 del; 163 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