RFR: 8347366: RISC-V: Add extension asserts for CMO instructions [v2]

[Fei Yang]

On Fri, 10 Jan 2025 08:33:59 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Hi please consider this minor improvement.
>> 
>> Sanity tested.
>> 
>> Thanks, Robbin
>
> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comments

Marked as reviewed by fyang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23015#pullrequestreview-2542029312