message: Remove space from constant folding pass name
diff: @@ -49,7 +49,7 @@ class ConstantFolding : public GraphOptimizer {
  ~ConstantFolding() override {}
  - string name() const override { return "constant folding"; };
  + string name() const override { return "constant_folding"; };
  bool UsesFunctionLibrary() const override { return false; }
  