[crac] RFR: 8368929: [CRaC] Move CPUFeatures check to C/R engine

[Radim Vansa]

On Tue, 30 Sep 2025 13:17:54 GMT, Radim Vansa <rvansa at openjdk.org> wrote:

> Right now the logic checking if CPU features used before checkpoint match current CPU features is in VM code. VM stores and retrieves CPU features through C/R API's user_data extension. This is convenient when we have a single image that can be either accepted or rejected, but does not offer the flexibility for C/R engine to select the best image for current execution environment.
> 
> The goal of this issue is to move to a declarative API that will express the requirements using more abstract means, labels (for CPU architecture) and bitmaps (for CPU features).

@jankratochvil Please give this a review, since you've authored most of the modified code.

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PR Comment: https://git.openjdk.org/crac/pull/266#issuecomment-3352114136