RFR: 8356159: RISC-V: Add Zabha [v5]

[Robbin Ehn]

On Mon, 26 May 2025 11:53:44 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Good find, thank you!
>
> Seems the Acq variants is missed? I see `compareAndSwapBAcq`, `compareAndSwapSAcq`, `compareAndExchangeBAcq` and `compareAndExchangeSAcq` still uses fixed registers for oldval and newval.
> (Edit: And unused `cr` on input list)

Thanks again! My search pattern missed it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25252#discussion_r2107375282