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Add vpx_clear_system_state() in SSIM based rdmult adjustments

Change-Id: I2a0cdec3bfce864e975aaa408cfdcb855db8680f

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -270,6 +270,7 @@

   const int index = row * num_cols + col;

   assert(cpi->oxcf.tuning == VP8_TUNE_SSIM);

+  vpx_clear_system_state();

   return cpi->mi_ssim_rdmult_scaling_factors[index];

 }

@@ -312,6 +313,7 @@

     const double ssim_factor =

         get_ssim_rdmult_scaling_factor(cpi, mi_row, mi_col);

     x->rdmult = (int)(ssim_factor * x->rdmult);

+    vpx_clear_system_state();

   }

   // required by vp9_append_sub8x8_mvs_for_idx() and vp9_find_best_ref_mvs()

@@ -1963,6 +1965,7 @@

     const double ssim_factor =

         get_ssim_rdmult_scaling_factor(cpi, mi_row, mi_col);

     x->rdmult = (int)(ssim_factor * x->rdmult);

+    vpx_clear_system_state();

   }

 }

@@ -2208,6 +2211,7 @@

       const double ssim_factor =

           get_ssim_rdmult_scaling_factor(cpi, mi_row, mi_col);

       x->rdmult = (int)(ssim_factor * x->rdmult);

+      vpx_clear_system_state();

     }

   }

@@ -3823,6 +3827,7 @@

     const double ssim_factor =

         get_ssim_rdmult_scaling_factor(cpi, mi_row, mi_col);

     partition_mul = (int)(ssim_factor * partition_mul);

+    vpx_clear_system_state();

   }

   (void)*tp_orig;