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added 8x8 based Rate estimation for dualpred case

This commmit added logic for MB using dual-pred to compute rate
estimation based on correct transform size. The section of code
was previously located under #if CONFIG_DUALPRED, that was made
to be working with T8x8 experiment at the same time.

Change-Id: Iebc2518c03f11378b9c2e72905520f088b54d5c0

--- a/vp8/encoder/rdopt.c

+++ b/vp8/encoder/rdopt.c

@@ -2855,7 +2855,15 @@

                                                    &x->e_mbd.predictor[320], 16, 8);

             /* Y cost and distortion */

-            macro_block_yrd(x, &rate_y, &distortion, IF_RTCD(&cpi->rtcd.encodemb));

+#if CONFIG_T8X8

+             if(cpi->common.txfm_mode == ALLOW_8X8)

+                macro_block_yrd_8x8(x, &rate_y, &distortion,

+                                IF_RTCD(&cpi->rtcd));

+            else

+#endif

+                macro_block_yrd(x, &rate_y, &distortion,

+                                IF_RTCD(&cpi->rtcd.encodemb));

+

             rate2 += rate_y;

             distortion2 += distortion;