RFR: 8351165: Remove unused includes from vmStructs [v5]

[Coleen Phillimore]

On Tue, 4 Mar 2025 23:00:13 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Please review this trivial change to remove some unneeded includes and type declarations from vmStructs.  The SystemDictionary type is unused because classes are looked up in the ClassLoaderDataGraph in the SA, and they haven't been in a single SystemDictionary for a very long time.
>> Tested with SA tests locally.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove more friends.

Thanks Kim.  I'm going to continue to claim this is trivial.

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PR Comment: https://git.openjdk.org/jdk/pull/23897#issuecomment-2701871901