RFR: 8351165: Remove unused includes from vmStructs [v3]

[Kim Barrett]

On Tue, 4 Mar 2025 13:22:24 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:
> 
>   Change the SystemDictionary section header comment too.

I think that if classes are being removed from here that the friendship with
VMStructs by those classes should also be removed.

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Changes requested by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23897#pullrequestreview-2657808981