A change in the way we place TransitionElementKinds in the tree.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 98b05d147a290d67e10cbe57daae8bc2f73b02ea..00f7610561cda3744c4fffa15f6b6b8f420f9885 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -242,6 +242,7 @@ class HLoopInformation: public ZoneObject {
   HStackCheck* stack_check_;
 };
 
+
 class BoundsCheckTable;
 class HGraph: public ZoneObject {
  public:
@@ -377,6 +378,7 @@ class HGraph: public ZoneObject {
                               int32_t integer_value);
 
   void MarkAsDeoptimizingRecursively(HBasicBlock* block);
+  void InsertElementsTransitions();
   void InsertTypeConversions(HInstruction* instr);
   void PropagateMinusZeroChecks(HValue* value, BitVector* visited);
   void RecursivelyMarkPhiDeoptimizeOnUndefined(HPhi* phi);
@@ -1139,31 +1141,31 @@ class HGraphBuilder: public AstVisitor {
                                      HValue* right);
   HInstruction* BuildIncrement(bool returns_original_input,
                                CountOperation* expr);
-  HInstruction* BuildFastElementAccess(HValue* elements,
-                                       HValue* checked_key,
-                                       HValue* val,
-                                       HValue* dependency,
-                                       ElementsKind elements_kind,
-                                       bool is_store);
-
-  HInstruction* TryBuildConsolidatedElementLoad(HValue* object,
-                                                HValue* key,
-                                                HValue* val,
-                                                SmallMapList* maps);
-
-  HInstruction* BuildUncheckedMonomorphicElementAccess(HValue* object,
-                                                       HValue* key,
-                                                       HValue* val,
-                                                       HCheckMaps* mapcheck,
-                                                       Handle<Map> map,
-                                                       bool is_store);
-
-  HInstruction* BuildMonomorphicElementAccess(HValue* object,
-                                              HValue* key,
-                                              HValue* val,
-                                              HValue* dependency,
-                                              Handle<Map> map,
-                                              bool is_store);
+  ArrayInstruction* BuildFastElementAccess(HValue* elements,
+                                                    HValue* checked_key,
+                                                    HValue* val,
+                                                    HValue* dependency,
+                                                    ElementsKind elements_kind,
+                                                    bool is_store);
+
+  ArrayInstruction* TryBuildConsolidatedElementLoad(HValue* object,
+                                                           HValue* key,
+                                                           HValue* val,
+                                                           SmallMapList* maps);
+
+  ArrayInstruction* BuildUncheckedMonomorphicElementAccess(HValue* object,
+                                                   HValue* key,
+                                                   HValue* val,
+                                                   HCheckMaps* mapcheck,
+                                                   Handle<Map> map,
+                                                   bool is_store);
+
+  ArrayInstruction* BuildMonomorphicElementAccess(HValue* object,
+                                            HValue* key,
+                                            HValue* val,
+                                            HValue* dependency,
+                                            Handle<Map> map,
+                                            bool is_store);
 
   HValue* HandlePolymorphicElementAccess(HValue* object,
                                          HValue* key,
@@ -1198,7 +1200,7 @@ class HGraphBuilder: public AstVisitor {
                                           Property* expr,
                                           Handle<Map> map);
   HInstruction* BuildLoadKeyedGeneric(HValue* object, HValue* key);
-  HInstruction* BuildExternalArrayElementAccess(
+  ArrayInstruction* BuildExternalArrayElementAccess(
       HValue* external_elements,
       HValue* checked_key,
       HValue* val,