RFR: 8361076: Add benchmark for ImageReader in preparation for Valhalla changes [v4]

[Severin Gehwolf]

On Tue, 15 Jul 2025 21:27:16 GMT, David Beaumont <duke at openjdk.org> wrote:

> Oddly while the status at the bottom of the conversation says it has "2 approvals", the tickbox:
> 
> ```
> Change must be properly reviewed (2 reviews required, with at least 1 Reviewer, 1 Author
> ```
> 
> is not checked. I can try to integrate, but it might not work.

I believe the review of @magicus no longer counts since he reviewed an old version of the patch. Once he acks again it should work.

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PR Comment: https://git.openjdk.org/jdk/pull/26044#issuecomment-3078764090