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

[Fei Yang]

On Tue, 5 Nov 2024 09:54:42 GMT, Hamlin Li <mli at openjdk.org> wrote:

> Do it really makes sense to have instruction set selection diagnostic:

This was once discussed somewhere else before. Again, here is what I am thinking. First of all, we might don't want to expose these options for our end users. You will need to add to the release note for newly-added product options. There are quite a few for now and I suppose there will be more and more to come. So it's more reasonable to me to delegate to hwprobe. But if we do that, we still need a way to diagnostic or disable them when issues come (whether performance or functionality related). I don't see a better solution than making them DIAGNOSTIC ones.

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PR Comment: https://git.openjdk.org/jdk/pull/21885#issuecomment-2456745978