Refactor mc reference block fetch in denoiser
Refactor mc reference block fetch in denoiser

This commit refactors the motion compensated reference block fetch
process in denoiser. It skips the stage that generates motion
compensated reference block if denoiser decides to use copy block
mode. For high motion clips, this could speed up the denoising
process by about 10%.

Change-Id: I8ef4fa5fe766a8c4529119b9ec01faefb3d4ef53

liqianggao/libvpx,charup/https---github.com-webmproject-libvpx-,reimaginemedia/webm.libvpx,goodleixiao/vpx,running770/libvpx,ShiftMediaProject/libvpx,altogother/webm.libvpx,Acidburn0zzz/webm.libvpx,luctrudeau/aom,mwgoldsmith/libvpx,mbebenita/aom,jdm/libvpx,shacklettbp/aom,jmvalin/aom,VTCSecureLLC/libvpx,openpeer/libvpx_new,thdav/aom,webmproject/libvpx,Acidburn0zzz/webm.libvpx,openpeer/libvpx_new,mbebenita/aom,charup/https---github.com-webmproject-libvpx-,jacklicn/webm.libvpx,reimaginemedia/webm.libvpx,goodleixiao/vpx,iniwf/webm.libvpx,jmvalin/aom,ittiamvpx/libvpx-1,jdm/libvpx,VTCSecureLLC/libvpx,mbebenita/aom,felipebetancur/libvpx,mwgoldsmith/vpx,zofuthan/libvpx,altogother/webm.libvpx,luctrudeau/aom,reimaginemedia/webm.libvpx,thdav/aom,matanbs/webm.libvpx,pcwalton/libvpx,Maria1099/webm.libvpx,webmproject/libvpx,gshORTON/webm.libvpx,webmproject/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,ittiamvpx/libvpx-1,smarter/aom,running770/libvpx,shyamalschandra/libvpx,shacklettbp/aom,openpeer/libvpx_new,Suvarna1488/webm.libvpx,jdm/libvpx,charup/https---github.com-webmproject-libvpx-,mbebenita/aom,felipebetancur/libvpx,Topopiccione/libvpx,shareefalis/libvpx,mwgoldsmith/vpx,kim42083/webm.libvpx,kim42083/webm.libvpx,gshORTON/webm.libvpx,jmvalin/aom,goodleixiao/vpx,kleopatra999/webm.libvpx,jacklicn/webm.libvpx,pcwalton/libvpx,liqianggao/libvpx,GrokImageCompression/aom,kalli123/webm.libvpx,iniwf/webm.libvpx,VTCSecureLLC/libvpx,gshORTON/webm.libvpx,running770/libvpx,openpeer/libvpx_new,Distrotech/libvpx,VTCSecureLLC/libvpx,ittiamvpx/libvpx-1,mwgoldsmith/libvpx,goodleixiao/vpx,pcwalton/libvpx,charup/https---github.com-webmproject-libvpx-,kleopatra999/webm.libvpx,Topopiccione/libvpx,liqianggao/libvpx,zofuthan/libvpx,shacklettbp/aom,gshORTON/webm.libvpx,hsueceumd/test_hui,VTCSecureLLC/libvpx,kleopatra999/webm.libvpx,lyx2014/libvpx_c,shyamalschandra/libvpx,gshORTON/webm.libvpx,Suvarna1488/webm.libvpx,reimaginemedia/webm.libvpx,reimaginemedia/webm.libvpx,Acidburn0zzz/webm.libvpx,abwiz0086/webm.libvpx,GrokImageCompression/aom,mwgoldsmith/vpx,altogother/webm.libvpx,goodleixiao/vpx,Topopiccione/libvpx,charup/https---github.com-webmproject-libvpx-,gshORTON/webm.libvpx,Distrotech/libvpx,matanbs/webm.libvpx,zofuthan/libvpx,kalli123/webm.libvpx,stewnorriss/libvpx,jmvalin/aom,Acidburn0zzz/webm.libvpx,mwgoldsmith/libvpx,mbebenita/aom,zofuthan/libvpx,Topopiccione/libvpx,iniwf/webm.libvpx,webmproject/libvpx,Maria1099/webm.libvpx,shyamalschandra/libvpx,running770/libvpx,mbebenita/aom,GrokImageCompression/aom,Suvarna1488/webm.libvpx,thdav/aom,abwiz0086/webm.libvpx,VTCSecureLLC/libvpx,Acidburn0zzz/webm.libvpx,jdm/libvpx,kalli123/webm.libvpx,stewnorriss/libvpx,shacklettbp/aom,Topopiccione/libvpx,ShiftMediaProject/libvpx,kleopatra999/webm.libvpx,Distrotech/libvpx,liqianggao/libvpx,thdav/aom,Maria1099/webm.libvpx,abwiz0086/webm.libvpx,zofuthan/libvpx,lyx2014/libvpx_c,charup/https---github.com-webmproject-libvpx-,stewnorriss/libvpx,lyx2014/libvpx_c,shacklettbp/aom,luctrudeau/aom,Distrotech/libvpx,felipebetancur/libvpx,pcwalton/libvpx,felipebetancur/libvpx,Distrotech/libvpx,kim42083/webm.libvpx,luctrudeau/aom,GrokImageCompression/aom,jacklicn/webm.libvpx,Suvarna1488/webm.libvpx,ittiamvpx/libvpx-1,smarter/aom,pcwalton/libvpx,mbebenita/aom,kim42083/webm.libvpx,mwgoldsmith/vpx,kalli123/webm.libvpx,hsueceumd/test_hui,altogother/webm.libvpx,kleopatra999/webm.libvpx,jacklicn/webm.libvpx,smarter/aom,matanbs/webm.libvpx,shyamalschandra/libvpx,jacklicn/webm.libvpx,Maria1099/webm.libvpx,ShiftMediaProject/libvpx,ittiamvpx/libvpx-1,jdm/libvpx,kalli123/webm.libvpx,goodleixiao/vpx,stewnorriss/libvpx,hsueceumd/test_hui,stewnorriss/libvpx,hsueceumd/test_hui,shareefalis/libvpx,Suvarna1488/webm.libvpx,Distrotech/libvpx,felipebetancur/libvpx,pcwalton/libvpx,mwgoldsmith/vpx,matanbs/webm.libvpx,luctrudeau/aom,kim42083/webm.libvpx,altogother/webm.libvpx,shareefalis/libvpx,iniwf/webm.libvpx,abwiz0086/webm.libvpx,Maria1099/webm.libvpx,liqianggao/libvpx,zofuthan/libvpx,running770/libvpx,smarter/aom,GrokImageCompression/aom,shyamalschandra/libvpx,thdav/aom,shacklettbp/aom,mbebenita/aom,Suvarna1488/webm.libvpx,liqianggao/libvpx,mwgoldsmith/libvpx,iniwf/webm.libvpx,reimaginemedia/webm.libvpx,lyx2014/libvpx_c,stewnorriss/libvpx,Maria1099/webm.libvpx,running770/libvpx,matanbs/webm.libvpx,lyx2014/libvpx_c,kalli123/webm.libvpx,altogother/webm.libvpx,openpeer/libvpx_new,webmproject/libvpx,hsueceumd/test_hui,openpeer/libvpx_new,jdm/libvpx,kleopatra999/webm.libvpx,lyx2014/libvpx_c,mbebenita/aom,shareefalis/libvpx,shareefalis/libvpx,matanbs/webm.libvpx,hsueceumd/test_hui,shyamalschandra/libvpx,abwiz0086/webm.libvpx,ShiftMediaProject/libvpx,thdav/aom,shareefalis/libvpx,felipebetancur/libvpx,iniwf/webm.libvpx,ittiamvpx/libvpx-1,GrokImageCompression/aom,smarter/aom,Topopiccione/libvpx,kim42083/webm.libvpx,jmvalin/aom,luctrudeau/aom,abwiz0086/webm.libvpx,smarter/aom,jmvalin/aom,webmproject/libvpx,Acidburn0zzz/webm.libvpx,jacklicn/webm.libvpx