Clean up node iteration

src/compiler/generic-node-inl.h

Index: src/compiler/generic-node-inl.h
diff --git a/src/compiler/generic-node-inl.h b/src/compiler/generic-node-inl.h
index afbd1f0ebf2067eb35cb370c16a7b7f5eefe2aa5..13bfa6c24ffa9252146ca90c6bcb90d3155cc14f 100644
--- a/src/compiler/generic-node-inl.h
+++ b/src/compiler/generic-node-inl.h
@@ -49,6 +49,19 @@ GenericNode<B, S>::Inputs::end() {
 }
 
 template <class B, class S>
+inline typename GenericNode<B, S>::InputEdges::iterator
+GenericNode<B, S>::InputEdges::begin() {
+  return typename GenericNode<B, S>::InputEdges::iterator(this->node_, 0);
+}
+
+template <class B, class S>
+inline typename GenericNode<B, S>::InputEdges::iterator
+GenericNode<B, S>::InputEdges::end() {
+  return typename GenericNode<B, S>::InputEdges::iterator(
+      this->node_, this->node_->InputCount());
+}
+
+template <class B, class S>
 inline typename GenericNode<B, S>::Uses::iterator
 GenericNode<B, S>::Uses::begin() {
   return typename GenericNode<B, S>::Uses::iterator(this->node_);
@@ -61,6 +74,18 @@ GenericNode<B, S>::Uses::end() {
 }
 
 template <class B, class S>
+inline typename GenericNode<B, S>::UseEdges::iterator
+GenericNode<B, S>::UseEdges::begin() {
+  return typename GenericNode<B, S>::UseEdges::iterator(this->node_);
+}
+
+template <class B, class S>
+inline typename GenericNode<B, S>::UseEdges::iterator
+GenericNode<B, S>::UseEdges::end() {
+  return typename GenericNode<B, S>::UseEdges::iterator();
+}
+
+template <class B, class S>
 void GenericNode<B, S>::ReplaceUses(GenericNode* replace_to) {
   for (Use* use = first_use_; use != NULL; use = use->next) {
     use->from->GetInputRecordPtr(use->input_index)->to = replace_to;
@@ -98,9 +123,8 @@ void GenericNode<B, S>::ReplaceUsesIf(UnaryPredicate pred,
 
 template <class B, class S>
 void GenericNode<B, S>::RemoveAllInputs() {
-  for (typename Inputs::iterator iter(inputs().begin()); iter != inputs().end();
-       ++iter) {
-    iter.GetInput()->Update(NULL);
+  for (auto edge : input_edges()) {
+    edge.UpdateTo(NULL);
   }
 }