[lworld] RFR: 8372954: [lworld] Remove old implementation of the substitutability test method [v5]

[Frederic Parain]

On Tue, 3 Feb 2026 16:13:22 GMT, Paul Hübner <phubner at openjdk.org> wrote:

>> Hi all,
>> 
>> This change removes the old substitutability test method. The new/alt substitutability test takes the place of the legacy test, and all identifiers with "alt" are removed.
>> 
>> Testing: tiers 1-5 on Linux (x64, AArch64), macOS (x64, AArch64), Windows (x64).
>
> Paul Hübner has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Silly typo
>  - Improve comment, refer to where they are injected

Looks good to me.

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Marked as reviewed by fparain (Committer).

PR Review: https://git.openjdk.org/valhalla/pull/2012#pullrequestreview-3746691632