RFR: 8315338: RISC-V: Change flags for stable extensions to non-experimental

[Feilong Jiang]

On Wed, 13 Sep 2023 12:31:39 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> > There is still no hardware support for these extensions for now. IMHO, it's better to keep the experimental flags for them. We could add some checks to prevent enabling these experimental extensions by default:
> > ```c++
> > if (!UnlockExperimentalVMOptions && UseRVV) {
> >   FLAG_SET_DEFAULT(UseRVV, false);
> > }
> > ```
> 
> I think the nice thing auto enabling of these is that we get a lot of bake-time. Manually adding the options for your hardware/qemu setup is often overlooked. Just my 5 cent.

That make sense too, I'm okay with that then.

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PR Comment: https://git.openjdk.org/jdk/pull/15585#issuecomment-1717600533