RFR: 8369685: RISC-V: refactor code related to RVFeatureValue::enabled [v4]

[Hamlin Li]

On Thu, 16 Oct 2025 15:37:28 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> @robehn Thanks for the offline discussion!
>> It makes sense to me to use DEFAULT_VALUE in `RVExtFeatureValue::value()`.
>
> Thank you.
> Now value() behave the same regardless of implementation.

Thanks for reviewing!

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PR Review Comment: https://git.openjdk.org/jdk/pull/27771#discussion_r2436616771