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Moved call to vp9_clear_system_state() to a proper location

The commit moved a call to vp9_clear_system_state() to a correct
location, i.e. prior function calls using floating point numbers.
This was to fix a mismatch mmx code and sse2 version, where a
floating point number used in adjust_frame_rate(cpi) gets NAN due
to mmx registers being in wrong state.

Change-Id: I40e0a6de98812000ccee6a729badb630604fd7e6

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -2703,6 +2703,9 @@

     cpi->last_end_time_stamp_seen = cpi->source->ts_start;

   }

+  // Clear down mmx registers

+  vp9_clear_system_state();

+

   // adjust frame rates based on timestamps given

   if (cm->show_frame) {

     adjust_frame_rate(cpi);

@@ -2716,9 +2719,6 @@

   // start with a 0 size frame

   *size = 0;

-

-  // Clear down mmx registers

-  vp9_clear_system_state();

   /* find a free buffer for the new frame, releasing the reference previously

    * held.