Cosmetic change mbmi->ref_frame to refs
Cosmetic change mbmi->ref_frame to refs

In handle_inter_mode, the reference frames are set in refs buffer.
One can use refs buffer directly to avoid redundant fetch.

Change-Id: I811d408cae52dcd5e053dd4bfe69550eb6a2ff56

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