message: Initilize var.def.cls to unknown.
diff: @@ -387,7 +387,7 @@ struct VarDefDefinitionData {
  // Type which declares this one.
  optional<TypeId> declaring_type;
  - VarClass cls;
  + VarClass cls = VarClass::Unknown;
  bool is_local() const { return cls == VarClass::Local; }
  bool is_macro() const { return cls == VarClass::Macro; }
  