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Accumulate tx_totals counters in multi-threaded encoder

Tx_totals counters weren't handled correctly in multi-thread
case, which caused the mismatch while encoding using threads > 1.
This patch fixed that.

Change-Id: Ice9b0386f57175fb92a0bdcd5042686a3106246a

--- a/vp9/common/vp9_thread_common.c

+++ b/vp9/common/vp9_thread_common.c

@@ -382,6 +382,9 @@

       cm->counts.tx.p8x8[i][j] += counts->tx.p8x8[i][j];

   }

+  for (i = 0; i < TX_SIZES; i++)

+    cm->counts.tx.tx_totals[i] += counts->tx.tx_totals[i];

+

   for (i = 0; i < SKIP_CONTEXTS; i++)

     for (j = 0; j < 2; j++)

       cm->counts.skip[i][j] += counts->skip[i][j];