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

[Hamlin Li]

On Tue, 5 Nov 2024 08:16:59 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

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

Do you suggest to keep it as Product or Experimental?

The full sentences are as below:

// DIAGNOSTIC options are not meant for VM tuning or for product modes.
//    They are to be used for VM quality assurance or field diagnosis
//    of VM bugs.  They are hidden so that users will not be encouraged to
//    try them as if they were VM ordinary execution options.  However, they
//    are available in the product version of the VM.  Under instruction
//    from support engineers, VM customers can turn them on to collect
//    diagnostic information about VM problems.


I think it should not be Experimental anymore, and seems it's better than Product, and can be used in product (`However, they are available in the product version of the VM`). But I'm not quite sure.

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PR Comment: https://git.openjdk.org/jdk/pull/21885#issuecomment-2456723371