[crac] RFR: Keep _features the same after CRaC restore

[Jan Kratochvil]

On Fri, 11 Aug 2023 12:11:19 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

> Extending `_features` may change ABI or existing JIT-compiled code. Unfortunately we cannot use more advanced CPU features after restore, we need to stick to the same features of CPU used to make the checkpoint file.

Is this update OK or not? Most of the changes (moving the methods under `VM_Version::CpuidInfo`) could be attempted to be upstreamed to OpenJDK as I find them as a cleanup.

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PR Comment: https://git.openjdk.org/crac/pull/103#issuecomment-1678651722