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

[Fei Yang]

On Wed, 6 Sep 2023 08:55:59 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Hi all, please consider.
> 
> These flags can be automatically turned on if you are using a 6.5 kernel with the proper hardware.
> So they are not considered experimental.
> 
> Running tier1

Looks reasonable. These four options are there for a long time and have quite some bake-time.

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15585#pullrequestreview-1614471014