RFR: 8367253: RISC-V: refactor dependent cpu extensions [v5]

[Hamlin Li]

On Mon, 29 Sep 2025 21:26:04 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Thanks for catching! I'll just remove it in this pr.
>> 
>> It should have been added in `UPDATE_DEFAULT_DEP(flag, dep0, ...)`, to do the similar work as the assert at https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/riscv/vm_version_riscv.hpp#L92. But seems previous way (introduced in https://github.com/openjdk/jdk/pull/24094) does not work as expected to catch declarations out of dependend orders, `verify_deps` does not catch it either as it inherits the way in the pr 24094.
>> 
>> I'll investigate it later and fix it in another pr.
>
> I don't think the previous assert introduced in https://github.com/openjdk/jdk/pull/24094 is necessary.
> So we are good to just remove the related code.

check https://github.com/openjdk/jdk/pull/27562

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PR Review Comment: https://git.openjdk.org/jdk/pull/27171#discussion_r2389329229