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Prevent accidental changes to the previous frame mode_infos

This is needed to fix mbgraph but shouldn't affect anything else

Change-Id: I2f515052f62e348cd3794b7ff0c139802225ea95

--- a/vp9/decoder/vp9_onyxd_if.c

+++ b/vp9/decoder/vp9_onyxd_if.c

@@ -397,6 +397,10 @@

     cm->mi_grid_visible = cm->mi_grid_base + cm->mode_info_stride + 1;

     cm->prev_mi_grid_visible = cm->prev_mi_grid_base + cm->mode_info_stride + 1;

+    pbi->mb.mi_8x8 = cm->mi_grid_visible;

+    pbi->mb.mi_8x8[0] = cm->mi;

+    pbi->mb.this_mi = cm->mi;

+

     cm->current_video_frame++;

   }

--- a/vp9/encoder/vp9_onyx_if.c

+++ b/vp9/encoder/vp9_onyx_if.c

@@ -3453,6 +3453,10 @@

     cm->mi = cm->mip + cm->mode_info_stride + 1;

     cm->mi_grid_visible = cm->mi_grid_base + cm->mode_info_stride + 1;

+    cpi->mb.e_mbd.mi_8x8 = cm->mi_grid_visible;

+    cpi->mb.e_mbd.mi_8x8[0] = cm->mi;

+    cpi->mb.e_mbd.this_mi = cm->mi;

+

     // Don't increment frame counters if this was an altref buffer

     // update not a real frame

     ++cm->current_video_frame;

-- 

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