[LCG] Make the iterator move constructable (and thus movable in general)

now that there is essentially no cost to doing so. Yay C++11.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203447 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/LazyCallGraph.h

@@ -132,7 +132,7 @@ public:
 
   public:
     iterator(const iterator &Arg) : G(Arg.G), NI(Arg.NI) {}
-
+    iterator(iterator &&Arg) : G(Arg.G), NI(std::move(Arg.NI)) {}
     iterator &operator=(iterator Arg) {
       std::swap(Arg, *this);
       return *this;