RFR: 8319781: RISC-V: Refactor UseRVV related checks [v3]

[Fei Yang]

On Mon, 13 Nov 2023 16:42:11 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Hi,
>> Can you review the patch to refactor the code related UseRVV checks?
>> Thanks!
>> 
>> There are some code (flag setting/checking) depending on UseRVV's value, these code should be refactored, especially after the change of https://bugs.openjdk.org/browse/JDK-8319408:
>> 1. some code needs to get the final UseRVV's value rather than the initial value, e.g. ChaCha20 intrinsic.
>> 2. refactored to be more readable.
>> 3. also add note to make sure the future code get the final UseRVV value instead of inital value.
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove code setting SpecialEncodeISOArray

Updated change looks good. Thanks.

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Marked as reviewed by fyang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16580#pullrequestreview-1729060632