RFR: 8359493: Refactor how aggregated mandatory warnings are handled in the compiler [v4]

[Archie Cobbs]

On Thu, 3 Jul 2025 10:00:14 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> These transformations could be also done in Java code inside `ClassGenerator` right?

Yes, that's simpler. Thanks for this and your other suggestions - all good ones. They should all be addressed in 2b16d65758b.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25810#discussion_r2183204177