Use SSSE3 for 2d filters larger than 16
Use SSSE3 for 2d filters larger than 16

The C code was being used as a fallback for the >16 case, but only for 2D.

Change-Id: I1e2e6da9e4b28bd88bde9ba4dd32724ce466cf6f

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