A fix in optimize_b for new-quant
A fix in optimize_b for new-quant

Change-Id: I5a7bd3c2d0c7f6cf714367674f1d75510659b54d

GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,mbebenita/aom,smarter/aom,luctrudeau/aom,luctrudeau/aom,luctrudeau/aom,mbebenita/aom,luctrudeau/aom,mbebenita/aom,luctrudeau/aom,GrokImageCompression/aom,mbebenita/aom,GrokImageCompression/aom,smarter/aom,mbebenita/aom,mbebenita/aom,mbebenita/aom,mbebenita/aom,smarter/aom,GrokImageCompression/aom,GrokImageCompression/aom,luctrudeau/aom,smarter/aom,smarter/aom,mbebenita/aom