RFR: 8345177: RISC-V: Add gtests for cmpxchg [v2]

[Robbin Ehn]

On Mon, 2 Dec 2024 00:16:37 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove CMF barrier
>
> Updated change looks good. Thanks.

Thanks @RealFYang and @Hamlin-Li !

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PR Comment: https://git.openjdk.org/jdk/pull/22437#issuecomment-2511487018