Add SSSE3 implementation for ipred_cfl_ac_420 and ipred_cfl_ac_422
cfl_ac_420_w4_8bpc_c: 1621.0
cfl_ac_420_w4_8bpc_ssse3: 92.5
cfl_ac_420_w8_8bpc_c: 3344.1
cfl_ac_420_w8_8bpc_ssse3: 115.4
cfl_ac_420_w16_8bpc_c: 6024.9
cfl_ac_420_w16_8bpc_ssse3: 187.8
cfl_ac_422_w4_8bpc_c: 1762.5
cfl_ac_422_w4_8bpc_ssse3: 81.4
cfl_ac_422_w8_8bpc_c: 4941.2
cfl_ac_422_w8_8bpc_ssse3: 166.5
cfl_ac_422_w16_8bpc_c: 8261.8
cfl_ac_422_w16_8bpc_ssse3: 272.3