It is buggy in some Linux because the unique_ptr will be free however
the std::string trying to use that char*.

Moreover, it is no need to demangle for error log by Paddle.
Just use `c++filt` or other shell utilities to do this.

* Wrong Printf format before

* Make `PADDLE_ENFORCE_EQ` supports custom class, like DDim

* fix some enforce

* remove compatible_type to avoid compile error

* remove shared_ptr

* fix tensor error msg

* Make interface of Operator to `const Scope&`

* Use EnforceNotMet to unify all exception types.

Basically from caffe2::logging.h, but only expose `PADDLE_ENFORCE`
interface.