message: fix the const map initializatoin
diff: @@ -201,7 +201,7 @@ void InferShapes(
  const IFunctionBuilderRegistry* func_registry) {
  InferShapesImpl(
  g,
  - {},
  + std::unordered_map<std::string, TypeProto*>(0),
  opset_imports,
  schema_registry,
  func_registry);
  @@ -219,7 +219,7 @@ void InferShapes(
  auto* g = m.mutable_graph();
  InferShapesImpl(
  g,
  - {},
  + std::unordered_map<std::string, TypeProto*>(0),
  opset_imports,
  schema_registry,
  func_registry);
  