RFR: 8352218: RISC-V: Zvfh requires RVV [v2]

[Robbin Ehn]

On Thu, 20 Mar 2025 16:03:34 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> You can check that in compile time with:
>> `STATIC_ASSERT(offsetof(VM_Version, ext_ZvXX) > offsetof(VM_Version, ext_V));`
>
> That's also fine.

Added normal assert, as it was much easier.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24094#discussion_r2009702923