LV: Replace SIMD assembly routines with intrinsics or ORC

[kaixiong]

Task list

• visual_mem_copy (Use libc)
• visual_mem_set (Use libc)
• Bilinear scaling of 32-bit videos (Intrinsics)
• Alpha Blending of 32-bit videos (Intrinsics)
• SIMD math routines (ORC)
• SIMD visual_mem_set16, visual_mem_set32