Clean up node iteration

src/compiler/node.h

Index: src/compiler/node.h
diff --git a/src/compiler/node.h b/src/compiler/node.h
index 8a442cedbc7aed407eda1e7f88d6388df58cdba3..41aa1ee518859b203754c19b13fa27feabaedcc1 100644
--- a/src/compiler/node.h
+++ b/src/compiler/node.h
@@ -82,12 +82,15 @@ typedef NodeVectorVector::reverse_iterator NodeVectorVectorRIter;
 typedef Node::Uses::iterator UseIter;
 typedef Node::Inputs::iterator InputIter;
 
+typedef GenericEdge<Node> Edge;
+
 // Helper to extract parameters from Operator1<*> nodes.
 template <typename T>
 static inline const T& OpParameter(const Node* node) {
   return OpParameter<T>(node->op());
 }
 
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8