Merge pull request #4667 from PaddlePaddle/reyoung-patch-1

Removed unreached code

Author: luotao1

paddle/framework/data_type.h

@@ -28,7 +28,6 @@ inline DataType ToDataType(std::type_index type) {
  return DataType::INT32;
  } else {
  PADDLE_THROW("Not supported");
- return static_cast<DataType>(-1);
  }
 }