vp9_rdopt.c: Use int64_t for dist_sum and rate_sum in model_rd_for_sb().
vp9_rdopt.c: Use int64_t for dist_sum and rate_sum in model_rd_for_sb().

Removes unnecessary casts and silences warnings.

Change-Id: Ic516a909a2b3748831be6717f02d86ca60190af3

Suvarna1488/webm.libvpx,mbebenita/aom,mwgoldsmith/libvpx,Distrotech/libvpx,luctrudeau/aom,VTCSecureLLC/libvpx,kleopatra999/webm.libvpx,GrokImageCompression/aom,shacklettbp/aom,jacklicn/webm.libvpx,gshORTON/webm.libvpx,webmproject/libvpx,matanbs/webm.libvpx,stewnorriss/libvpx,luctrudeau/aom,running770/libvpx,luctrudeau/aom,shareefalis/libvpx,lyx2014/libvpx_c,ittiamvpx/libvpx-1,ittiamvpx/libvpx-1,Suvarna1488/webm.libvpx,Maria1099/webm.libvpx,openpeer/libvpx_new,zofuthan/libvpx,openpeer/libvpx_new,Acidburn0zzz/webm.libvpx,stewnorriss/libvpx,matanbs/vp982,abwiz0086/webm.libvpx,ittiamvpx/libvpx,Suvarna1488/webm.libvpx,lyx2014/libvpx_c,mwgoldsmith/vpx,luctrudeau/aom,matanbs/vp982,openpeer/libvpx_new,gshORTON/webm.libvpx,shacklettbp/aom,pcwalton/libvpx,liqianggao/libvpx,iniwf/webm.libvpx,VTCSecureLLC/libvpx,openpeer/libvpx_new,reimaginemedia/webm.libvpx,mwgoldsmith/libvpx,jmvalin/aom,jdm/libvpx,mwgoldsmith/libvpx,Distrotech/libvpx,webmproject/libvpx,Suvarna1488/webm.libvpx,kleopatra999/webm.libvpx,shareefalis/libvpx,running770/libvpx,GrokImageCompression/aom,charup/https---github.com-webmproject-libvpx-,goodleixiao/vpx,Distrotech/libvpx,altogother/webm.libvpx,felipebetancur/libvpx,Topopiccione/libvpx,jacklicn/webm.libvpx,GrokImageCompression/aom,shareefalis/libvpx,kim42083/webm.libvpx,WebRTC-Labs/libvpx,liqianggao/libvpx,jdm/libvpx,pcwalton/libvpx,Maria1099/webm.libvpx,mbebenita/aom,jacklicn/webm.libvpx,Laknot/libvpx,stewnorriss/libvpx,abwiz0086/webm.libvpx,webmproject/libvpx,WebRTC-Labs/libvpx,webmproject/libvpx,Distrotech/libvpx,ittiamvpx/libvpx-1,mbebenita/aom,ShiftMediaProject/libvpx,n4t/libvpx,jmvalin/aom,Maria1099/webm.libvpx,iniwf/webm.libvpx,lyx2014/libvpx_c,mbebenita/aom,VTCSecureLLC/libvpx,WebRTC-Labs/libvpx,matanbs/webm.libvpx,matanbs/vp982,goodleixiao/vpx,kim42083/webm.libvpx,altogother/webm.libvpx,felipebetancur/libvpx,reimaginemedia/webm.libvpx,running770/libvpx,stewnorriss/libvpx,kleopatra999/webm.libvpx,mwgoldsmith/vpx,stewnorriss/libvpx,shyamalschandra/libvpx,shacklettbp/aom,jacklicn/webm.libvpx,openpeer/libvpx_new,felipebetancur/libvpx,goodleixiao/vpx,hsueceumd/test_hui,kalli123/webm.libvpx,felipebetancur/libvpx,charup/https---github.com-webmproject-libvpx-,felipebetancur/libvpx,ShiftMediaProject/libvpx,jacklicn/webm.libvpx,shacklettbp/aom,n4t/libvpx,kalli123/webm.libvpx,altogother/webm.libvpx,jacklicn/webm.libvpx,iniwf/webm.libvpx,mwgoldsmith/vpx,jdm/libvpx,stewnorriss/libvpx,kleopatra999/webm.libvpx,VTCSecureLLC/libvpx,Suvarna1488/webm.libvpx,pcwalton/libvpx,altogother/webm.libvpx,Topopiccione/libvpx,lyx2014/libvpx_c,gshORTON/webm.libvpx,thdav/aom,GrokImageCompression/aom,reimaginemedia/webm.libvpx,WebRTC-Labs/libvpx,ittiamvpx/libvpx,n4t/libvpx,Laknot/libvpx,ittiamvpx/libvpx-1,kalli123/webm.libvpx,liqianggao/libvpx,zofuthan/libvpx,jdm/libvpx,Acidburn0zzz/webm.libvpx,charup/https---github.com-webmproject-libvpx-,Laknot/libvpx,pcwalton/libvpx,lyx2014/libvpx_c,charup/https---github.com-webmproject-libvpx-,goodleixiao/vpx,running770/libvpx,pcwalton/libvpx,smarter/aom,shareefalis/libvpx,openpeer/libvpx_new,luctrudeau/aom,mwgoldsmith/vpx,kleopatra999/webm.libvpx,altogother/webm.libvpx,thdav/aom,luctrudeau/aom,zofuthan/libvpx,iniwf/webm.libvpx,Laknot/libvpx,smarter/aom,Acidburn0zzz/webm.libvpx,mwgoldsmith/libvpx,WebRTC-Labs/libvpx,ittiamvpx/libvpx,webmproject/libvpx,Maria1099/webm.libvpx,shyamalschandra/libvpx,goodleixiao/vpx,running770/libvpx,Maria1099/webm.libvpx,reimaginemedia/webm.libvpx,n4t/libvpx,webmproject/libvpx,shareefalis/libvpx,Topopiccione/libvpx,VTCSecureLLC/libvpx,gshORTON/webm.libvpx,mwgoldsmith/libvpx,shyamalschandra/libvpx,liqianggao/libvpx,abwiz0086/webm.libvpx,hsueceumd/test_hui,matanbs/vp982,kim42083/webm.libvpx,ittiamvpx/libvpx,jmvalin/aom,matanbs/vp982,Suvarna1488/webm.libvpx,GrokImageCompression/aom,Topopiccione/libvpx,jmvalin/aom,mbebenita/aom,n4t/libvpx,smarter/aom,kleopatra999/webm.libvpx,matanbs/webm.libvpx,hsueceumd/test_hui,matanbs/webm.libvpx,kim42083/webm.libvpx,kalli123/webm.libvpx,kim42083/webm.libvpx,smarter/aom,mbebenita/aom,mwgoldsmith/libvpx,kim42083/webm.libvpx,zofuthan/libvpx,thdav/aom,Acidburn0zzz/webm.libvpx,smarter/aom,jmvalin/aom,ShiftMediaProject/libvpx,Acidburn0zzz/webm.libvpx,Acidburn0zzz/webm.libvpx,Laknot/libvpx,matanbs/vp982,zofuthan/libvpx,Distrotech/libvpx,gshORTON/webm.libvpx,pcwalton/libvpx,Topopiccione/libvpx,matanbs/webm.libvpx,thdav/aom,VTCSecureLLC/libvpx,gshORTON/webm.libvpx,reimaginemedia/webm.libvpx,ShiftMediaProject/libvpx,liqianggao/libvpx,abwiz0086/webm.libvpx,mwgoldsmith/vpx,ittiamvpx/libvpx-1,ittiamvpx/libvpx,mbebenita/aom,jdm/libvpx,shacklettbp/aom,shareefalis/libvpx,thdav/aom,ittiamvpx/libvpx-1,hsueceumd/test_hui,ShiftMediaProject/libvpx,matanbs/vp982,shyamalschandra/libvpx,ittiamvpx/libvpx,zofuthan/libvpx,GrokImageCompression/aom,reimaginemedia/webm.libvpx,kalli123/webm.libvpx,jmvalin/aom,mbebenita/aom,jdm/libvpx,felipebetancur/libvpx,abwiz0086/webm.libvpx,abwiz0086/webm.libvpx,hsueceumd/test_hui,Maria1099/webm.libvpx,running770/libv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