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Short circuit rate_block in block_rd_txfm.

Don't run rate_block (cost_coeffs) if distortion alone is enough to
surpass best_rd.

This decreases 2nd pass runtime on HD at speed 2 by about 2%. There is
zero effect on output if tx_cache is removed.

Change-Id: Ia3b1cc77bfbe6ee988c395fde06c0eb92940b784

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -551,6 +551,12 @@

 #endif  // CONFIG_VP9_HIGHBITDEPTH

   }

+  rd = RDCOST(x->rdmult, x->rddiv, 0, dist);

+  if (args->this_rd + rd > args->best_rd) {

+    args->exit_early = 1;

+    return;

+  }

+

   rate = rate_block(plane, block, plane_bsize, tx_size, args);

   rd1 = RDCOST(x->rdmult, x->rddiv, rate, dist);

   rd2 = RDCOST(x->rdmult, x->rddiv, 0, sse);