RFR: 8330095: RISC-V: Remove obsolete vandn_vi instruction

[Gui Cao]

On Thu, 11 Apr 2024 11:23:32 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Hi, We notice that the `vandn_vi` instruction is defined in the current code and is not used anywhere, it is not available in the riscv-crypto Release-1.0.0 manual. The `vandn_vi` instruction is present in earlier riscv-crypto manual, but the `vandnvi` has been removed from the https://github.com/riscv/riscv-crypto/commit/82a02f09668adb18dfee5dfc45a0ce7d3af10103 commit.
>> 
>> ### Testing
>> - [x]  fastdebug build successfully
>
> LGTM.

@RealFYang @luhenry : Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/18737#issuecomment-2051310245