RFR: 8320995: RISC-V: C2 PopCountVI [v5]

[Fei Yang]

On Wed, 8 May 2024 08:53:22 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Hi,
>> Can you help to review this patch?
>> Both auto-vect and vector api depends on this intrinsic.
>> Thanks!
>> 
>> ## Performance
>> Not performance test was done, as this depends on vcpop.v instruction in zvbb extension and the code seqeunce is rather simple than non-intrinsic version.
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   minor fix

Marked as reviewed by fyang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19065#pullrequestreview-2045152467