RFR: 8339992: RISC-V: some minor improvements of base64_vector_decode_round [v2]

[Fei Yang]

On Wed, 18 Sep 2024 14:25:10 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Hi,
>> Can you help to review this simple improvement?
>> Thanks.
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   rename

Marked as reviewed by fyang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21059#pullrequestreview-2312869400