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

[Jie Fu]

On Wed, 1 Dec 2021 18:41:33 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

> Yes, the patch doesn't change behavior on AVX2 and older AVX512 systems.

Thanks for your clarification.
But it still remains unknown why the 64-byte instructions shouldn't be used on CPUs which don't support `serialize`.

I will test the 64-byte instructions on older AVX512 systems today and feedback here.

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