[lworld] RFR: 8372075: [lworld] Information about the layout of a TypeAryPtr is only available if it is exact

[Tobias Hartmann]

On Tue, 18 Nov 2025 11:19:51 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

> Hi,
> 
> The layout of a flat `TypeAryPtr` can only be obtained if it is exact. This small patch refactors `TypeAryPtr::flat_layout_helper` and similar methods to use `exact_klass()` instead of `klass()`, and add an additional condition for when we can compute `_field_offset` during `TypeAryPtr::add_field_offset_and_offset`. We can then remove the extra condition in `TypeAryPtr::compute_klass`.
> 
> Please leave your reviews, thanks a lot.

Nice cleanup. Looks good to me!

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Marked as reviewed by thartmann (Committer).

PR Review: https://git.openjdk.org/valhalla/pull/1744#pullrequestreview-3478023783