RFR: 8345322: RISC-V: Add concurrent gtests for cmpxchg variants [v4]

[Robbin Ehn]

On Thu, 12 Dec 2024 09:46:46 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Inclusive case
>
> Nice work. Thanks!

Thanks @Hamlin-Li @RealFYang 

But I wanted to add the edge cases, so I found an issue in the gtest.

Fixed! Please have another look!

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PR Comment: https://git.openjdk.org/jdk/pull/22574#issuecomment-2538985120