[crac] RFR: 8368929: [CRaC] Move CPUFeatures check to C/R engine [v7]

[Radim Vansa]

On Tue, 7 Oct 2025 12:03:55 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).
>
> Radim Vansa has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Fixup
>  - Review update

Apologies for my sloppiness on memory allocation.

-------------

PR Comment: https://git.openjdk.org/crac/pull/266#issuecomment-3376600292