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Use vp9_zero in sub8x8 RD optimiazion loop

Change-Id: Ic23a705e48cadaa7151f2bd8536d56636cb973e3

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -3782,7 +3782,7 @@

     if (cm->mcomp_filter_type == SWITCHABLE)

       assert(best_filter_diff[SWITCHABLE_FILTERS] == 0);

   } else {

-    vpx_memset(best_filter_diff, 0, sizeof(best_filter_diff));

+    vp9_zero(best_filter_diff);

   }

   if (!x->skip) {

@@ -3793,7 +3793,7 @@

         best_tx_diff[i] = best_rd - best_tx_rd[i];

     }

   } else {

-    vpx_memset(best_tx_diff, 0, sizeof(best_tx_diff));

+    vp9_zero(best_tx_diff);

   }

   set_scale_factors(xd, mbmi->ref_frame[0], mbmi->ref_frame[1],

@@ -3863,8 +3863,8 @@

   unsigned char best_zcoeff_blk[256] = { 0 };

   x->skip_encode = cpi->sf.skip_encode_frame && xd->q_index < QIDX_SKIP_THRESH;

-  vpx_memset(x->zcoeff_blk, 0, sizeof(x->zcoeff_blk));

-  vpx_memset(ctx->zcoeff_blk, 0, sizeof(ctx->zcoeff_blk));

+  vp9_zero(x->zcoeff_blk);

+  vp9_zero(ctx->zcoeff_blk);

   for (i = 0; i < 4; i++) {

     int j;