cleanup: remove unused code in mc-a2.asm
cleanup: remove unused code in pixel-a.asm
cleanup: remove unused constant in pixel-a.asm
cleanup: remove unused code in mc-a.asm
asm: assembly code for dequant_normal
cleanup the temporary function pointer initialization
 asm : routine for weight_pp(), for input width in multiples of 16
Test bench modifications for weight_pp() asm routine.
Adding asm function declaration and initialization for weight_pp asm routine.
asm: move constant 8192 to const-a.asm for share
asm : routine for weight_sp().
Adding asm function declaration and initialization for weight_sp asm routine
 Test bench modifications for weight_sp() asm routine
asm: assembly code for sse_ss - 4xN, 8xN, 16xN
Test bench: code for pixel_var
asm: assembly code for pixel_sse_ss_12x16
asm: code for pixel_var_8xN
asm: assembly code for intra_pred_planar[4x4]
asm: assembly code for pixel_sse_ss_32xN
asm: code for pixel_var_16xN