Many classes (e.g. in common stl implementations) contain user-written copy and move constructors that are identical to the implicit ones. This far ExprEngine could only handle the official "trivial" case. This patch extends ExprEngine for copy and move constructors that are user provided but in all other aspects they are the same as trivial ones.
A typical example is the GNU implementation of the iterator of std::deque, where the user provided copy constructor of the non-const version also accepts an instance of the const version as parameter. This patch allows correct simulation of this iterator.