message: Temporarily disable concat rewrite.
diff: @@ -65,7 +65,7 @@ class ArithmeticOptimizer : public GraphOptimizer {
  bool remove_redundant_bitcast = true;
  bool remove_redundant_cast = true;
  bool remove_negation = true;
  - bool hoist_cwise_unary_chains = true;
  + bool hoist_cwise_unary_chains = false;
  bool convert_sqrt_div_to_rsqrt_mul = false;
  bool remove_idempotent = true;
  