16bpc loop restoration Zen 2

taskset -c 4-7,12-15 /home/bluezakm/dav1d_clang_O3_LTO_march-native/build/tests/checkasm  --test=looprestoration_16bpc --bench
checkasm: using random seed 2654184077
SSSE3:
 - looprestoration_16bpc.wiener [OK]
 - looprestoration_16bpc.sgr    [OK]
AVX2:
 - looprestoration_16bpc.wiener [OK]
 - looprestoration_16bpc.sgr    [OK]
checkasm: all 14 tests passed
nop: 48.0
sgr_3x3_10bpc_c: 305565.7
sgr_3x3_10bpc_ssse3: 113015.7
sgr_3x3_10bpc_avx2: 78605.3
sgr_5x5_10bpc_c: 254229.4
sgr_5x5_10bpc_ssse3: 70826.1
sgr_5x5_10bpc_avx2: 49489.0
sgr_mix_10bpc_c: 547626.8
sgr_mix_10bpc_ssse3: 188009.7
sgr_mix_10bpc_avx2: 127509.9
wiener_5tap_10bpc_c: 60111.8
wiener_5tap_10bpc_ssse3: 23843.5
wiener_5tap_10bpc_avx2: 11986.6
wiener_5tap_12bpc_c: 60529.3
wiener_5tap_12bpc_ssse3: 23823.8
wiener_5tap_12bpc_avx2: 12005.6
wiener_7tap_10bpc_c: 60235.5
wiener_7tap_10bpc_ssse3: 28142.8
wiener_7tap_10bpc_avx2: 13930.3
wiener_7tap_12bpc_c: 59956.2
wiener_7tap_12bpc_ssse3: 28155.7
wiener_7tap_12bpc_avx2: 13942.2