RFR: 8277426: Optimize mask reduction operations on x86 [v2]

[Jie Fu]

On Wed, 24 Nov 2021 03:58:00 GMT, Jie Fu <jiefu at openjdk.org> wrote:

>>> @DamonFool Could you please review this patch?
>> 
>> I will do some testing and feedback.
>> Thanks.
>
>> > @DamonFool Could you please review this patch?
>> 
>> I will do some testing and feedback. Thanks.
> 
> All the tests passed.
> But I'm not sure whether all avx512 machines support bmi1 and lzcnt features.

> @DamonFool Thanks a lot for your review. Do I need a re-review from @sviswa7 now?

Yes, I think so.
Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/6447