build_intra_predictors*: reduce left_col size
build_intra_predictors*: reduce left_col size

this should only need to be the size of the largest block, i.e., 32, not
64.

Change-Id: Ib8cb2424771fdd2a64c55379597248b2722a5ceb

ShiftMediaProject/libvpx,felipebetancur/libvpx,liqianggao/libvpx,Topopiccione/libvpx,zofuthan/libvpx,Topopiccione/libvpx,webmproject/libvpx,smarter/aom,Topopiccione/libvpx,webmproject/libvpx,mwgoldsmith/libvpx,goodleixiao/vpx,running770/libvpx,goodleixiao/vpx,mbebenita/aom,mwgoldsmith/vpx,Topopiccione/libvpx,jmvalin/aom,thdav/aom,smarter/aom,smarter/aom,mwgoldsmith/libvpx,ittiamvpx/libvpx-1,VTCSecureLLC/libvpx,mbebenita/aom,goodleixiao/vpx,jmvalin/aom,ittiamvpx/libvpx-1,Topopiccione/libvpx,ittiamvpx/libvpx-1,running770/libvpx,stewnorriss/libvpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,stewnorriss/libvpx,goodleixiao/vpx,jmvalin/aom,stewnorriss/libvpx,mbebenita/aom,openpeer/libvpx_new,Topopiccione/libvpx,mbebenita/aom,goodleixiao/vpx,ittiamvpx/libvpx-1,shacklettbp/aom,shyamalschandra/libvpx,running770/libvpx,thdav/aom,openpeer/libvpx_new,stewnorriss/libvpx,running770/libvpx,mbebenita/aom,luctrudeau/aom,ShiftMediaProject/libvpx,jmvalin/aom,shacklettbp/aom,webmproject/libvpx,shacklettbp/aom,GrokImageCompression/aom,mwgoldsmith/vpx,VTCSecureLLC/libvpx,liqianggao/libvpx,liqianggao/libvpx,mwgoldsmith/libvpx,zofuthan/libvpx,luctrudeau/aom,shyamalschandra/libvpx,ittiamvpx/libvpx-1,mbebenita/aom,thdav/aom,shacklettbp/aom,running770/libvpx,luctrudeau/aom,webmproject/libvpx,felipebetancur/libvpx,zofuthan/libvpx,GrokImageCompression/aom,openpeer/libvpx_new,felipebetancur/libvpx,felipebetancur/libvpx,zofuthan/libvpx,shyamalschandra/libvpx,zofuthan/libvpx,ittiamvpx/libvpx-1,mwgoldsmith/libvpx,thdav/aom,webmproject/libvpx,luctrudeau/aom,shyamalschandra/libvpx,smarter/aom,luctrudeau/aom,mwgoldsmith/vpx,stewnorriss/libvpx,mbebenita/aom,VTCSecureLLC/libvpx,mwgoldsmith/vpx,smarter/aom,webmproject/libvpx,shyamalschandra/libvpx,GrokImageCompression/aom,mbebenita/aom,shacklettbp/aom,jmvalin/aom,mwgoldsmith/vpx,thdav/aom,mwgoldsmith/libvpx,shacklettbp/aom,openpeer/libvpx_new,liqianggao/libvpx,thdav/aom,smarter/aom,jmvalin/aom,shyamalschandra/libvpx,goodleixiao/vpx,GrokImageCompression/aom,VTCSecureLLC/libvpx,liqianggao/libvpx,luctrudeau/aom,felipebetancur/libvpx,GrokImageCompression/aom,VTCSecureLLC/libvpx,mbebenita/aom,VTCSecureLLC/libvpx,zofuthan/libvpx,ShiftMediaProject/libvpx,openpeer/libvpx_new,ShiftMediaProject/libvpx,felipebetancur/libvpx,stewnorriss/libvpx,liqianggao/libvpx,running770/libvpx,GrokImageCompression/aom,openpeer/libvpx_new