RFR: 8277617: Adjust AVX3Threshold for copy/fill stubs [v6]

[David Holmes]

On Tue, 30 Nov 2021 00:10:39 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> Currently 32-byte instructions are used for small array copy and clear. 
>> This can be optimized by using 64-byte instructions.
>> 
>> Please review.
>> 
>> Best Regards,
>> Sandhya
>
> Sandhya Viswanathan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix whitespace

Marked as reviewed by dholmes (Reviewer).

Please check the GHA test results before integrating - there is a failing compiler test.

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PR: https://git.openjdk.java.net/jdk/pull/6512