Added an emms to prevent invalid stats output

In certain hardware configuration, where mmx code is enabled and
other simd (sse2/sse3) disabled, lacking of this emms caused invalid
internal stats outputs.

Change-Id: I77c61cf6e0448d3f3b8c11781aa9e42f31d231c9

vp8/encoder/onyx_if.c

@@ -2670,6 +2670,8 @@ void vp8_remove_compressor(VP8_PTR *ptr)
 
 #if CONFIG_INTERNAL_STATS
 
+        vp8_clear_system_state();
+
         if (cpi->pass != 1)
         {
             FILE *f = fopen("opsnr.stt", "a");