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x86/filmgrain: Don't use AVX2 for fgy, fguv on CPUs with slow gather

Matthias Dressel requested to merge another/dav1d:cpuid-zen into master

Filmgrain is using a lot of vpgatherdd instructions which are rather slow on certain chips, making the SSSE3 version faster.

Fixes #377 (closed)

Edited by Matthias Dressel

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