RFR: 8329083: RISC-V: Update profiles supported on riscv

[Hamlin Li]

On Thu, 4 Apr 2024 09:17:13 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> In fact, when I worked on it, I'm bit confused what it should be? including optional or not.
>> 
>> Peviously, zfh is already enabled by the RVA22U64, but it's optional by [spec](https://github.com/riscv/riscv-profiles/blob/main/profiles.adoc#613-rva22u64-optional-extensions), so I followed this pattern.
>
> Yeah, I think that's a mistake. I don't think it's safe to assume availability of optional extensions. We should only assume mandatory extensions in each profile.

Sure, I will correct it, thanks for discussion.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18599#discussion_r1551350888