avx2: [gcm] AVX2 YMM/256-bit GCM implementation based on AVX2 XMM/128-bit one
Two loops co-exist at the moment: - by 16, used for messages longer than 512 bytes - by 8, used for smaller messages or to finish last blocks of long message (partial blocks) - AVX2 and AVX512 GHASH key compute need to be different than the AVX one (different hash key layout)
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