RFR: 8343555: RISC-V: make UseZvfh diagnostic option

[Robbin Ehn]

On Mon, 4 Nov 2024 18:33:00 GMT, Hamlin Li <mli at openjdk.org> wrote:

> Hi,
> Can you help to review this simple patch?
> Previously this UseZvfh was changed from experimental to product because we have real hardware to verify the feature, but as pointed out by @RealFYang , this one should ber a diagnostic option, as we don't want to expose too many options to users.
> Thanks

Ok, so the path is:
1: Exprimental (should they be turn on by hwprobe?)
2a: If hwprobe    => Diagnostic
2b: No hwprobe => Normal

Arguably hwprobe should only turn on diagnostic options then ?

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PR Comment: https://git.openjdk.org/jdk/pull/21885#issuecomment-2457083353