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vp9/decode_tiles_mt: move some inits from inner loop

worker copies of pbi/xd/counts only need to be initialized once

Change-Id: I0081a85b9c82d39573c22d2fd2c670ec2f7b8715

--- a/vp9/decoder/vp9_decodeframe.c

+++ b/vp9/decoder/vp9_decodeframe.c

@@ -1643,9 +1643,14 @@

   // Reset tile decoding hook

   for (n = 0; n < num_workers; ++n) {

     VPxWorker *const worker = &pbi->tile_workers[n];

+    TileWorkerData *const tile_data = &pbi->tile_worker_data[n];

     winterface->sync(worker);

+    tile_data->pbi = pbi;

+    tile_data->xd = pbi->mb;

+    tile_data->xd.counts =

+        cm->frame_parallel_decoding_mode ? NULL : &tile_data->counts;

     worker->hook = (VPxWorkerHook)tile_worker_hook;

-    worker->data1 = &pbi->tile_worker_data[n];

+    worker->data1 = tile_data;

     worker->data2 = &pbi->tile_worker_info[n];

   }

@@ -1699,11 +1704,7 @@

       TileInfo *const tile = (TileInfo*)worker->data2;

       TileBuffer *const buf = &tile_buffers[0][n];

-      tile_data->pbi = pbi;

-      tile_data->xd = pbi->mb;

       tile_data->xd.corrupted = 0;

-      tile_data->xd.counts = cm->frame_parallel_decoding_mode ?

-                             0 : &tile_data->counts;

       vp9_zero(tile_data->dqcoeff);

       vp9_tile_init(tile, cm, 0, buf->col);

       vp9_tile_init(&tile_data->xd.tile, cm, 0, buf->col);