[crac] RFR: 8368929: [CRaC] Move CPUFeatures check to C/R engine [v13]

[Timofei Pushkin]

On Fri, 10 Oct 2025 09:06:35 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 one additional commit since the last revision:
> 
>   VM_Features use Zero_Features on non-x86

Marked as reviewed by tpushkin (Committer).

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PR Review: https://git.openjdk.org/crac/pull/266#pullrequestreview-3325654217