[lworld] RFR: 8372954: [lworld] Remove old implementation of the substitutability test method [v3]

[Chen Liang]

On Tue, 3 Feb 2026 15:19:49 GMT, Frederic Parain <fparain at openjdk.org> wrote:

>> I have added the comments and briefly describes the field map records superclass fields so it is computed recursively and is present on AVCs.
>
> There's still the comment about the pre-allocated default value, concept that doesn't exist anymore.
> Instead, the slot is needed for the `.null_reset` static injected field, storing the value used to reset a nullable flat field when null is written to it.

Sure. I have revised the comments again, so this time we refer to their names and where they are added, so interested users can navigate on their own.

-------------

PR Review Comment: https://git.openjdk.org/valhalla/pull/2012#discussion_r2759839946