RFR: [bworld] Emit lint warnings if overriding method does not have same nullability [v7]

[Maurizio Cimadamore]

On Tue, 10 Feb 2026 18:44:30 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> if I remove this from the message then the `!` is not issued
>
> Aaaargh!
> 
> I never integrated this!
> 
> https://git.openjdk.org/valhalla/pull/1921

Now that we have integrated the related fix, the `!` should no longer be required

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PR Review Comment: https://git.openjdk.org/valhalla/pull/2058#discussion_r2793966176