RFR: 8351949: RISC-V: Cleanup and enable store-load peephole for membars [v4]

[Fei Yang]

On Tue, 18 Mar 2025 08:37:24 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> I can agree with '#', but why add a @ ?

I can't recall the history. Maybe just to mark that this is the start of a specific match rule thus making the opto asm more readable. Opto output of some of the match rules are kind of complex like the compare ones (`CmpF3` etc.). But a single `#` also works for me.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24035#discussion_r2000663209