vp8: Move loopfilter synchronization to end of encode_frame call.
vp8: Move loopfilter synchronization to end of encode_frame call.

Change-Id: I5bdfea7f51df1f1fa5d9c1597e96988acce6c2f2

webmproject/libvpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,mwgoldsmith/vpx,webmproject/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/vpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,Topopiccione/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,Topopiccione/libvpx,Topopiccione/libvpx,Topopiccione/libvpx,webmproject/libvpx,Topopiccione/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,mwgoldsmith/vpx,mwgoldsmith/vpx,Topopiccione/libvpx