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

[Sandhya Viswanathan]

On Tue, 23 Nov 2021 15:51:06 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> Mai Đặng Quân Anh has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
>> 
>>  - Merge branch 'master' into vectorMaskReduction
>>  - reduce some dependencies with spare register
>>  - improve mask reduction logic on AVX
>
> This needs another hotspot reviewer to review before integration.

@PaulSandoz Do we need another test run after the changes? If so, could you please help in running through your testing.

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