RFR: 8351949: RISC-V: Cleanup and enable store-load peephole for membars [v8]

[Robbin Ehn]

On Thu, 3 Apr 2025 09:24:46 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> There are several more which can be merge, such as membar_volatile_rvXX.
>> But I prefered having those for rvtso in one section and those for rvwmo in another section.
>> That is not a good approach?
>
> Seems to me it's better to merge these instruct. e..g when read the code, one needs to check what's the difference between these instructs, but found out they're exactly the same ones.
> Maybe we could have 3 sections?
> 
> // RVTSO
> ...
> // shared between RVTSO and RVWMO
> ...
> // RVWMO
> ...

@feilongjiang and @RealFYang what do you think ?

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PR Review Comment: https://git.openjdk.org/jdk/pull/24035#discussion_r2026630990