[vectorIntrinsics+compress] RFR: 8274975: Add micro benchmark: ALIBABA selective store use case [v2]

[Joshua Zhu]

On Wed, 13 Oct 2021 11:44:31 GMT, Joshua Zhu <jzhu at openjdk.org> wrote:

>> I separate my implementation of "compress" API into several patches for easy review.
>> This micro benchmark is extracted from the real use case inside in-memory databases: selectiveStore.
>> Test scenario: UseAVX=3; thread number = 8; conflict data percentage: 20% (that means 20% of mask bits are true)
>
> Joshua Zhu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update

Thanks for all your review comments. I update the benchmark accordingly.

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PR: https://git.openjdk.java.net/panama-vector/pull/149