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

Now we have normal and exprimental. Changing this one we would have also diagnostic.
And some we get from hwprobe and some not, it's not easy to know which ones to manually turn on, etc...
Wouldn't it make more sense to turn all options which may be enabled hwprobe to diagnostic instead?

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PR Comment: https://git.openjdk.org/jdk/pull/21885#issuecomment-2456842731