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

[Frederic Parain]

On Tue, 3 Feb 2026 16:06:56 GMT, Chen Liang <liach at openjdk.org> wrote:

>> 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.

Thank you for the updated comment.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/2012#discussion_r2760272852