RFR: 8344579: Clean up forward declarations and includes

[Coleen Phillimore]

On Tue, 19 Nov 2024 21:42:07 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> I was looking through the sources for something and found these forward declarations that should be removed. Please review this trivial change.
> 
> Sanity tested with tier1.  Will also verify GHA pass.

Thanks Stefan, I also changed the titles.

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PR Comment: https://git.openjdk.org/jdk/pull/22258#issuecomment-2486885188