Optimize innner loop of diffwtd_mask_highbd()
Optimize innner loop of diffwtd_mask_highbd()

Change-Id: I65b84bb82fa081ee8a455465fd791898b91c4544

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom