RFR: 8339992: RISC-V: some minor improvements of base64_vector_decode_round

[Ludovic Henry]

On Wed, 18 Sep 2024 12:57:41 GMT, Hamlin Li <mli at openjdk.org> wrote:

> Hi,
> Can you help to review this simple improvement?
> Thanks.

Marked as reviewed by luhenry (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/21059#pullrequestreview-2312768237