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Let YUV plane share the same dqcoeff buffer.

Remove unnecessary dqcoeff from macroblockd which reduce macroblockd
size by 16384 bytes.

Change-Id: Ia379a703b4fee81c8fd4698b52488a85a90c9bc2

--- a/vp9/common/vp9_blockd.h

+++ b/vp9/common/vp9_blockd.h

@@ -227,7 +227,8 @@

   DECLARE_ALIGNED(16, uint16_t, mc_buf_high[80 * 2 * 80 * 2]);

 #endif

-  DECLARE_ALIGNED(16, tran_low_t, dqcoeff[MAX_MB_PLANE][64 * 64]);

+  /* dqcoeff are shared by all the planes. So planes must be decoded serially */

+  DECLARE_ALIGNED(16, tran_low_t, dqcoeff[64 * 64]);

   int lossless;

   int corrupted;

--- a/vp9/common/vp9_onyxc_int.h

+++ b/vp9/common/vp9_onyxc_int.h

@@ -265,7 +265,7 @@

   int i;

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

-    xd->plane[i].dqcoeff = xd->dqcoeff[i];

+    xd->plane[i].dqcoeff = xd->dqcoeff;

     xd->above_context[i] = cm->above_context +

         i * sizeof(*cm->above_context) * 2 * mi_cols_aligned_to_sb(cm->mi_cols);

   }