RFR: 8313779: RISC-V: use andn / orn in the MD5 instrinsic [v2]

[Antonios Printezis]

On Sun, 6 Aug 2023 02:38:18 GMT, Fei Yang <fyang at openjdk.org> wrote:

> I think It should be more consistent if you use 'mv' instead as we did in other places when moving an immediate into register.

Thanks for the suggestion @RealFYang ! I thought `mv` was for register to register copy. But I'll change `li` to `mv` in those two places. I'll integrate the change as soon as I retest.

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PR Comment: https://git.openjdk.org/jdk/pull/15156#issuecomment-1667855653