RFR: 8286941: Add mask IR for partial vector operations for ARM SVE [v8]

[Xiaohong Gong]

On Thu, 30 Jun 2022 17:51:34 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Xiaohong Gong has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Address review comments
>
> An other test failed in tier2: compiler/loopopts/superword/TestPickFirstMemoryState.java
> Details are in RFE.

Hi @vnkozlov , the fixing is pushed to the PR. I tested the failure case on a avx-512 machine, and the failure gone. Could you please help to run the test again? Thanks a lot!

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PR: https://git.openjdk.org/jdk/pull/9037