RFR: 8319716: RISC-V: Add SHA-2

[Fei Yang]

On Wed, 8 Nov 2023 14:47:07 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> Hi, please consider.
> 
> Main author is @luhenry, I only fixed some minor things and tested it.
> 
> Such as:
> test/hotspot/jtreg/compiler/intrinsics/sha/
> test/jdk/java/security/MessageDigest/
> test/jdk/jdk/security/
> tier1
> 
> And still running some test.

src/hotspot/cpu/riscv/vm_version_riscv.cpp line 160:

> 158:   }
> 159: 
> 160:   if (UseZvknha && UseZvkb) {

A simple question here: Does the existence of `Zvknhb` means availability of `Zvknha`? Or should this be something like `if ((UseZvknha || UseZvknhb) && UseZvkb)`?

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PR Review Comment: https://git.openjdk.org/jdk/pull/16562#discussion_r1392153578