Improved uv mv calculations in build inter predictor
Improved uv mv calculations in build inter predictor

Changed calculations to use shifts instead of if-then-else.
Eliminates branches.

Change-Id: I11b75e8bb305301ffd9cb577fb7df059a3cf9ea4

shyamalschandra/libvpx,Topopiccione/libvpx,smarter/aom,Maria1099/webm.libvpx,n4t/libvpx,ShiftMediaProject/libvpx,sanyaade-teachings/libvpx,mwgoldsmith/libvpx,altogother/webm.libvpx,turbulenz/libvpx,shacklettbp/aom,vasilvv/esvp8,thdav/aom,iniwf/webm.libvpx,iniwf/webm.libvpx,jmvalin/aom,Distrotech/libvpx,goodleixiao/vpx,Maria1099/webm.libvpx,kalli123/webm.libvpx,turbulenz/libvpx,webmproject/libvpx,openpeer/libvpx_new,Acidburn0zzz/webm.libvpx,jmvalin/aom,jacklicn/webm.libvpx,Suvarna1488/webm.libvpx,turbulenz/libvpx,ittiamvpx/libvpx,mbebenita/aom,Suvarna1488/webm.libvpx,reimaginemedia/webm.libvpx,mbebenita/aom,shareefalis/libvpx,pcwalton/libvpx,Topopiccione/libvpx,altogother/webm.libvpx,jmvalin/aom,webmproject/libvpx,gshORTON/webm.libvpx,charup/https---github.com-webmproject-libvpx-,cinema6/libvpx,jdm/libvpx,WebRTC-Labs/libvpx,shareefalis/libvpx,mbebenita/aom,kleopatra999/webm.libvpx,shyamalschandra/libvpx,zofuthan/libvpx,shareefalis/libvpx,ittiamvpx/libvpx-1,matanbs/webm.libvpx,shacklettbp/aom,jacklicn/webm.libvpx,kalli123/webm.libvpx,altogother/webm.libvpx,lyx2014/libvpx_c,matanbs/vp982,turbulenz/libvpx,jmvalin/aom,lyx2014/libvpx_c,jdm/libvpx,Acidburn0zzz/webm.libvpx,iniwf/webm.libvpx,abwiz0086/webm.libvpx,pcwalton/libvpx,awatry/libvpx.opencl,Laknot/libvpx,Suvarna1488/webm.libvpx,shacklettbp/aom,Maria1099/webm.libvpx,mwgoldsmith/libvpx,matanbs/webm.libvpx,sanyaade-teachings/libvpx,matanbs/vp982,matanbs/vp982,mwgoldsmith/vpx,stewnorriss/libvpx,zofuthan/libvpx,felipebetancur/libvpx,n4t/libvpx,ittiamvpx/libvpx-1,mwgoldsmith/vpx,Maria1099/webm.libvpx,reimaginemedia/webm.libvpx,gshORTON/webm.libvpx,jmvalin/aom,matanbs/vp982,lyx2014/libvpx_c,Maria1099/webm.libvpx,matanbs/vp982,Topopiccione/libvpx,n4t/libvpx,smarter/aom,liqianggao/libvpx,felipebetancur/libvpx,jdm/libvpx,thdav/aom,kleopatra999/webm.libvpx,thdav/aom,kim42083/webm.libvpx,kim42083/webm.libvpx,kleopatra999/webm.libvpx,Distrotech/libvpx,ShiftMediaProject/libvpx,vasilvv/esvp8,jdm/libvpx,reimaginemedia/webm.libvpx,GrokImageCompression/aom,zofuthan/libvpx,zofuthan/libvpx,liqianggao/libvpx,Suvarna1488/webm.libvpx,ittiamvpx/libvpx,running770/libvpx,luctrudeau/aom,webmproject/libvpx,shacklettbp/aom,GrokImageCompression/aom,WebRTC-Labs/libvpx,matanbs/vp982,openpeer/libvpx_new,WebRTC-Labs/libvpx,turbulenz/libvpx,GrokImageCompression/aom,mwgoldsmith/vpx,vasilvv/esvp8,stewnorriss/libvpx,n4t/libvpx,kim42083/webm.libvpx,shyamalschandra/libvpx,abwiz0086/webm.libvpx,cinema6/libvpx,pcwalton/libvpx,charup/https---github.com-webmproject-libvpx-,shyamalschandra/libvpx,thdav/aom,Topopiccione/libvpx,WebRTC-Labs/libvpx,Acidburn0zzz/webm.libvpx,altogother/webm.libvpx,mbebenita/aom,jacklicn/webm.libvpx,pcwalton/libvpx,Maria1099/webm.libvpx,smarter/aom,vasilvv/esvp8,kalli123/webm.libvpx,mbebenita/aom,zofuthan/libvpx,liqianggao/libvpx,vasilvv/esvp8,Acidburn0zzz/webm.libvpx,Laknot/libvpx,stewnorriss/libvpx,VTCSecureLLC/libvpx,VTCSecureLLC/libvpx,openpeer/libvpx_new,felipebetancur/libvpx,running770/libvpx,reimaginemedia/webm.libvpx,ittiamvpx/libvpx,openpeer/libvpx_new,hsueceumd/test_hui,kim42083/webm.libvpx,smarter/aom,Suvarna1488/webm.libvpx,GrokImageCompression/aom,luctrudeau/aom,thdav/aom,Laknot/libvpx,mwgoldsmith/libvpx,jdm/libvpx,kleopatra999/webm.libvpx,gshORTON/webm.libvpx,sanyaade-teachings/libvpx,charup/https---github.com-webmproject-libvpx-,iniwf/webm.libvpx,GrokImageCompression/aom,webmproject/libvpx,running770/libvpx,jdm/libvpx,matanbs/webm.libvpx,jacklicn/webm.libvpx,awatry/libvpx.opencl,running770/libvpx,cinema6/libvpx,WebRTC-Labs/libvpx,hsueceumd/test_hui,shareefalis/libvpx,ittiamvpx/libvpx-1,liqianggao/libvpx,mbebenita/aom,awatry/libvpx.opencl,Distrotech/libvpx,matanbs/webm.libvpx,VTCSecureLLC/libvpx,mwgoldsmith/libvpx,Distrotech/libvpx,kim42083/webm.libvpx,matanbs/vp982,abwiz0086/webm.libvpx,reimaginemedia/webm.libvpx,altogother/webm.libvpx,felipebetancur/libvpx,kalli123/webm.libvpx,shacklettbp/aom,mwgoldsmith/libvpx,luctrudeau/aom,ittiamvpx/libvpx,ittiamvpx/libvpx-1,ittiamvpx/libvpx-1,cinema6/libvpx,ShiftMediaProject/libvpx,smarter/aom,goodleixiao/vpx,iniwf/webm.libvpx,awatry/libvpx.opencl,VTCSecureLLC/libvpx,kleopatra999/webm.libvpx,ittiamvpx/libvpx,gshORTON/webm.libvpx,turbulenz/libvpx,thdav/aom,stewnorriss/libvpx,kalli123/webm.libvpx,charup/https---github.com-webmproject-libvpx-,lyx2014/libvpx_c,Topopiccione/libvpx,lyx2014/libvpx_c,mwgoldsmith/vpx,n4t/libvpx,pcwalton/libvpx,sanyaade-teachings/libvpx,mwgoldsmith/libvpx,vasilvv/esvp8,Suvarna1488/webm.libvpx,gshORTON/webm.libvpx,abwiz0086/webm.libvpx,GrokImageCompression/aom,shareefalis/libvpx,hsueceumd/test_hui,kleopatra999/webm.libvpx,Acidburn0zzz/webm.libvpx,reimaginemedia/webm.libvpx,cinema6/libvpx,lyx2014/libvpx_c,cinema6/libvpx,charup/https---github.com-webmproject-libvpx-,kalli123/webm.libvpx,ittiamvpx/libvpx,Laknot/libvpx,shyamalschandra/libvpx,mbebenita/aom,jmvalin/aom,mbebenita/aom,running770/libvpx,mwgoldsmith/vpx,ittiamvpx/libvpx-1,pcwalton/libvpx,Acidburn0zzz/webm.libvpx,stewnorriss/libvpx,ShiftMediaP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