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Fix SIMD overflow in 12-bit ALF classification

Xiang Li requested to merge XiangLi/VVCSoftware_VTM:fix_alf_simd into master

When internal bit depth is 12-bit, the dynamic range of colSums is 16-bit. In this case, directly using _mm_add_epi16 on top of colSums may lead to overflow.

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