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

src/compiler/common-node-cache.h

Index: src/compiler/common-node-cache.h
diff --git a/src/compiler/common-node-cache.h b/src/compiler/common-node-cache.h
index ca43325e52ad439f3ded704e13ae82e35b336385..54795749d520082337ddc8ff153e128c341741a4 100644
--- a/src/compiler/common-node-cache.h
+++ b/src/compiler/common-node-cache.h
@@ -41,6 +41,14 @@ class CommonNodeCache FINAL : public ZoneObject {
 
   Zone* zone() const { return zone_; }
 
+  void GetCachedNodes(NodeVector* nodes) {
+    int32_constants_.GetCachedNodes(nodes);
+    int64_constants_.GetCachedNodes(nodes);
+    float64_constants_.GetCachedNodes(nodes);
+    external_constants_.GetCachedNodes(nodes);
+    number_constants_.GetCachedNodes(nodes);
+  }
+
  private:
   Int32NodeCache int32_constants_;
   Int64NodeCache int64_constants_;