[FIX] simd: Improve performance of avx512 int16_t blend
[FIX] simd: Improve performance of avx512 int16_t blend

xenigmax/seqan,xenigmax/seqan,xenigmax/seqan,xenigmax/seqan,xenigmax/seqan,xenigmax/seqan,xenigmax/seqan,xenigmax/seqan