Comment zcoeff_blk.
Comment zcoeff_blk.

Change-Id: Iefc2eb78e71472ecf51802ec59ff32caef4bd0f4

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