Add JSGraph::GetCachedNodes and NodeCache::GetCachedNodes. These routines are necessary in the dead…

src/compiler/js-graph.h

Index: src/compiler/js-graph.h
diff --git a/src/compiler/js-graph.h b/src/compiler/js-graph.h
index f2f7d4e35ad33cd03822d33a75c4cc312b49dd82..ab8b65060fe28b5f549076459dccfa5ee56b013a 100644
--- a/src/compiler/js-graph.h
+++ b/src/compiler/js-graph.h
@@ -105,6 +105,8 @@ class JSGraph : public ZoneObject {
   Zone* zone() { return graph()->zone(); }
   Isolate* isolate() { return zone()->isolate(); }
 
+  void GetCachedNodes(NodeVector* nodes);
+
  private:
   Graph* graph_;
   CommonOperatorBuilder* common_;
@@ -112,6 +114,7 @@ class JSGraph : public ZoneObject {
   Typer* typer_;
   MachineOperatorBuilder* machine_;
 
+  // TODO(titzer): make this into a simple array.
   SetOncePointer<Node> c_entry_stub_constant_;
   SetOncePointer<Node> undefined_constant_;
   SetOncePointer<Node> the_hole_constant_;