RFR: 8343555: RISC-V: make some verified (on hardware) extension options diagnostic [v2]

[Fei Yang]

On Wed, 6 Nov 2024 18:42:04 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
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   turn more verified extensions as DIAGNOSTIC

LGTM. Thanks.

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21885#pullrequestreview-2423360257