RFR: 8254814: [Vector API] Fix an AVX512 crash after JDK-8223347

[Jie Fu]

On Thu, 15 Oct 2020 16:04:22 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> As discussed here[1], it's time to integrate this fix.
>> And the original PR is here[2].
>> 
>> Testing:
>>   - All jdk/incubator/vector/ tests passed on Linux/x64 AVX512 machines
>> 
>> [1] https://github.com/openjdk/jdk/pull/367#issuecomment-701560441
>> [2] https://github.com/openjdk/panama-vector/pull/1
>
> Marked as reviewed by psandoz (Reviewer).

Thanks @iwanowww , @TobiHartmann and @PaulSandoz for your review.

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PR: https://git.openjdk.java.net/jdk/pull/676