Expand the idct4_c() function in idct8_c()
Expand the idct4_c() function in idct8_c()

Change-Id: I5afa3c351ba7c5e7deb3889f7471619ac60af255

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