x86: Add put_8tap_scaled AVX2 asm

mc_scaled_8tap_regular_w2_8bpc_c: 764.4
mc_scaled_8tap_regular_w2_8bpc_avx2: 191.3
mc_scaled_8tap_regular_w2_dy1_8bpc_c: 705.8
mc_scaled_8tap_regular_w2_dy1_8bpc_avx2: 89.5
mc_scaled_8tap_regular_w2_dy2_8bpc_c: 964.0
mc_scaled_8tap_regular_w2_dy2_8bpc_avx2: 120.3

mc_scaled_8tap_regular_w4_8bpc_c: 1355.7
mc_scaled_8tap_regular_w4_8bpc_avx2: 180.9
mc_scaled_8tap_regular_w4_dy1_8bpc_c: 1233.2
mc_scaled_8tap_regular_w4_dy1_8bpc_avx2: 115.3
mc_scaled_8tap_regular_w4_dy2_8bpc_c: 1707.6
mc_scaled_8tap_regular_w4_dy2_8bpc_avx2: 117.9

mc_scaled_8tap_regular_w8_8bpc_c: 2483.2
mc_scaled_8tap_regular_w8_8bpc_avx2: 294.8
mc_scaled_8tap_regular_w8_dy1_8bpc_c: 2166.4
mc_scaled_8tap_regular_w8_dy1_8bpc_avx2: 222.0
mc_scaled_8tap_regular_w8_dy2_8bpc_c: 3133.7
mc_scaled_8tap_regular_w8_dy2_8bpc_avx2: 292.6

mc_scaled_8tap_regular_w16_8bpc_c: 5239.2
mc_scaled_8tap_regular_w16_8bpc_avx2: 729.9
mc_scaled_8tap_regular_w16_dy1_8bpc_c: 5156.5
mc_scaled_8tap_regular_w16_dy1_8bpc_avx2: 602.2
mc_scaled_8tap_regular_w16_dy2_8bpc_c: 8018.4
mc_scaled_8tap_regular_w16_dy2_8bpc_avx2: 783.1

mc_scaled_8tap_regular_w32_8bpc_c: 14745.0
mc_scaled_8tap_regular_w32_8bpc_avx2: 2205.0
mc_scaled_8tap_regular_w32_dy1_8bpc_c: 14862.3
mc_scaled_8tap_regular_w32_dy1_8bpc_avx2: 1721.3
mc_scaled_8tap_regular_w32_dy2_8bpc_c: 23607.6
mc_scaled_8tap_regular_w32_dy2_8bpc_avx2: 2325.7

mc_scaled_8tap_regular_w64_8bpc_c: 54891.7
mc_scaled_8tap_regular_w64_8bpc_avx2: 8351.4
mc_scaled_8tap_regular_w64_dy1_8bpc_c: 50249.0
mc_scaled_8tap_regular_w64_dy1_8bpc_avx2: 5864.4
mc_scaled_8tap_regular_w64_dy2_8bpc_c: 79400.1
mc_scaled_8tap_regular_w64_dy2_8bpc_avx2: 8295.7

mc_scaled_8tap_regular_w128_8bpc_c: 121046.8
mc_scaled_8tap_regular_w128_8bpc_avx2: 21809.1
mc_scaled_8tap_regular_w128_dy1_8bpc_c: 133720.4
mc_scaled_8tap_regular_w128_dy1_8bpc_avx2: 16197.8
mc_scaled_8tap_regular_w128_dy2_8bpc_c: 218774.8
mc_scaled_8tap_regular_w128_dy2_8bpc_avx2: 22993.1