RFR: 8319716: RISC-V: Add SHA-2 [v2]

[Robbin Ehn]

On Wed, 15 Nov 2023 07:36:54 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
>> 
>>  - Flag fixes
>>  - Merge branch 'master' into sha256
>>  - Share code
>>  - SHA-2
>
> src/hotspot/cpu/riscv/stubGenerator_riscv.cpp line 4146:
> 
>> 4144:     Register ofs   = c_rarg2;
>> 4145:     Register limit = c_rarg3;
>> 4146:     Register consts = t0;
> 
> Similar here. Please consider using `t1` instead for `consts`.

Used t2 with spill.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16562#discussion_r1407833049