arm:mc: NEON implementation of blend, blend_h and blend_v function

	                A73	A53

blend_h_w2_8bpc_c:	149.3	246.8
blend_h_w2_8bpc_neon:	74.6	137
blend_h_w4_8bpc_c:	251.6	409.8
blend_h_w4_8bpc_neon:	66	146.6
blend_h_w8_8bpc_c:	446.6	844.1
blend_h_w8_8bpc_neon:	68.6	131.2
blend_h_w16_8bpc_c:	830	1513
blend_h_w16_8bpc_neon:	85.9	192
blend_h_w32_8bpc_c:	1605.2	2847.8
blend_h_w32_8bpc_neon:	149.8	357.6
blend_h_w64_8bpc_c:	3304.8	5515.5
blend_h_w64_8bpc_neon:	262.8	629.5
blend_h_w128_8bpc_c:	7895.1	13260.6
blend_h_w128_8bpc_neon:	577	1402
blend_v_w2_8bpc_c:	241.2	410.8
blend_v_w2_8bpc_neon:	122.1	196.8
blend_v_w4_8bpc_c:	874.4	1418.2
blend_v_w4_8bpc_neon:	248.5	375.9
blend_v_w8_8bpc_c:	1550.5	2514.7
blend_v_w8_8bpc_neon:	210.8	376
blend_v_w16_8bpc_c:	2925.3	5086
blend_v_w16_8bpc_neon:	253.4	608.3
blend_v_w32_8bpc_c:	5686.7	9470.5
blend_v_w32_8bpc_neon:	348.2	994.8
blend_w4_8bpc_c:	201.5	309.3
blend_w4_8bpc_neon:	38.6	99.2
blend_w8_8bpc_c:	531.3	944.8
blend_w8_8bpc_neon:	55.1	125.8
blend_w16_8bpc_c:	1992.8	3349.8
blend_w16_8bpc_neon:	150.1	344
blend_w32_8bpc_c:	4982	8165.9
blend_w32_8bpc_neon:	360.4	910.9