Cleanup inside vp9_reconinter.c.
Cleanup inside vp9_reconinter.c.

Using block width and block height instead of their logarithms. Using
SUBPEL_BITS and SUBPEL_SHIFTS constants instead of magic numbers.

Change-Id: I4e10e93c907c8a5e1cb27dfe74d1fcdcc4995448

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px,Laknot/libvpx,Acidburn0zzz/webm.libvpx,luctrudeau/aom,pcwalton/libvpx,mwgoldsmith/vpx,webmproject/libvpx,turbulenz/libvpx,felipebetancur/libvpx,running770/libvpx,thdav/aom,kalli123/webm.libvpx,shacklettbp/aom,felipebetancur/libvpx,webmproject/libvpx,liqianggao/libvpx,jmvalin/aom,webmproject/libvpx,jdm/libvpx,goodleixiao/vpx,VTCSecureLLC/libvpx,turbulenz/libvpx,kleopatra999/webm.libvpx,ShiftMediaProject/libvpx,running770/libvpx,VTCSecureLLC/libvpx,hsueceumd/test_hui,iniwf/webm.libvpx,shyamalschandra/libvpx,mbebenita/aom,abwiz0086/webm.libvpx,gshORTON/webm.libvpx,shacklettbp/aom,felipebetancur/libvpx,Topopiccione/libvpx,ittiamvpx/libvpx,charup/https---github.com-webmproject-libvpx-,ShiftMediaProject/libvpx,altogother/webm.libvpx,matanbs/vp982,lyx2014/libvpx_c,abwiz0086/webm.libvpx,zofuthan/libvpx,thdav/aom