vp8_bilinear_predict4x4_neon: init src vectors
vp8_bilinear_predict4x4_neon: init src vectors

quiets uninitialized warnings on the first load.

Change-Id: I58a5af337087d96b4eaea8991a0f85c4ba58aebe

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