RFR: 8360474: Add missing include guards for some HotSpot headers [v2]

[Stefan Karlsson]

On Wed, 25 Jun 2025 08:13:43 GMT, Qizheng Xing <qxing at openjdk.org> wrote:

>> Some HotSpot header files are missing include guards, which may cause compilation errors if these files are included multiple times. This patch adds include guards for them.
>
> Qizheng Xing has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove extra trailing new line

I don't think this needs to be backported and if it does we can backport the entire patch (or split out the necessary parts). I'll sponsor this.

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PR Comment: https://git.openjdk.org/jdk/pull/25968#issuecomment-3012143578