[riscv-port-jdk11u:riscv-port] RFR: 8316645: RISC-V: Remove dependency on libatomic by adding cmpxchg 1b [v2]

[Robbin Ehn]

On Mon, 11 Mar 2024 08:11:27 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> For CI builds it helps to remove this.
>> [8317335](https://bugs.openjdk.org/browse/JDK-8317335) is not needed as there is no gtest for atomic in 11.
>
> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix old compiler

Thanks!

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PR Comment: https://git.openjdk.org/riscv-port-jdk11u/pull/10#issuecomment-1989400715