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vp9: speed 8: Compute y sad without int_pro_motion_estimation.

Little change in overall PSNR in rtc. 2-4% speedup on VGA on ARM.

Change-Id: I3395806d7afd456deacd4077c330adca13ab0645

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

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

@@ -1141,7 +1141,13 @@

     mi->mv[0].as_int = 0;

     mi->interp_filter = BILINEAR;

-    y_sad = vp9_int_pro_motion_estimation(cpi, x, bsize, mi_row, mi_col);

+    if (cpi->oxcf.speed >= 8)

+      y_sad = cpi->fn_ptr[bsize].sdf(

+          x->plane[0].src.buf, x->plane[0].src.stride, xd->plane[0].pre[0].buf,

+          xd->plane[0].pre[0].stride);

+    else

+      y_sad = vp9_int_pro_motion_estimation(cpi, x, bsize, mi_row, mi_col);

+

     y_sad_last = y_sad;

     // Pick ref frame for partitioning, bias last frame when y_sad_g and y_sad

     // are close if short_circuit_low_temp_var is on.