Remove a now-dead map, patch by Saem Ghani, thanks!

llvm-svn: 24629

llvm/include/llvm/ADT/PostOrderIterator.h

@@ -47,7 +47,6 @@ class po_iterator : public forward_iterator<typename GT::NodeType, ptrdiff_t>,
   typedef typename GT::NodeType          NodeType;
   typedef typename GT::ChildIteratorType ChildItTy;
   
-  std::set<NodeType *> Visited;    // All of the blocks visited so far...
   // VisitStack - Used to maintain the ordering.  Top = current block
   // First element is basic block pointer, second is the 'next child' to visit
   std::stack<std::pair<NodeType *, ChildItTy> > VisitStack;