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

src/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 224 matching lines @@
 
  private:
   void AddBlock(HBasicBlock* block);
 
   ZoneList<HBasicBlock*> back_edges_;
   HBasicBlock* loop_header_;
   ZoneList<HBasicBlock*> blocks_;
   HStackCheck* stack_check_;
 };
 
+
 class BoundsCheckTable;
 class HGraph: public ZoneObject {
  public:
   explicit HGraph(CompilationInfo* info);
 
   Isolate* isolate() { return isolate_; }
   Zone* zone() const { return zone_; }
   CompilationInfo* info() const { return info_; }
 
   const ZoneList<HBasicBlock*>* blocks() const { return &blocks_; }
@@ skipping 115 matching lines @@
     uint32_instructions_->Add(instr, zone());
   }
 
  private:
   HConstant* GetConstant(SetOncePointer<HConstant>* pointer,
                          Handle<Object> value);
   HConstant* GetConstantInt32(SetOncePointer<HConstant>* pointer,
                               int32_t integer_value);
 
   void MarkAsDeoptimizingRecursively(HBasicBlock* block);
+  void InsertElementsTransitions();
   void InsertTypeConversions(HInstruction* instr);
   void PropagateMinusZeroChecks(HValue* value, BitVector* visited);
   void RecursivelyMarkPhiDeoptimizeOnUndefined(HPhi* phi);
   void InsertRepresentationChangeForUse(HValue* value,
                                         HValue* use_value,
                                         int use_index,
                                         Representation to);
   void InsertRepresentationChangesForValue(HValue* value);
   void InferTypes(ZoneList<HValue*>* worklist);
   void InitializeInferredTypes(int from_inclusive, int to_inclusive);
@@ skipping 742 matching lines @@
                                NilValue nil);
 
   HStringCharCodeAt* BuildStringCharCodeAt(HValue* context,
                                            HValue* string,
                                            HValue* index);
   HInstruction* BuildBinaryOperation(BinaryOperation* expr,
                                      HValue* left,
                                      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);
+  ArrayInstruction* 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);
+  ArrayInstruction* 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);
+  ArrayInstruction* 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* BuildMonomorphicElementAccess(HValue* object,
+                                            HValue* key,
+                                            HValue* val,
+                                            HValue* dependency,
+                                            Handle<Map> map,
+                                            bool is_store);
 
   HValue* HandlePolymorphicElementAccess(HValue* object,
                                          HValue* key,
                                          HValue* val,
                                          Expression* prop,
                                          BailoutId ast_id,
                                          int position,
                                          bool is_store,
                                          bool* has_side_effects);
 
@@ skipping 14 matching lines @@
                                       Property* expr);
   HInstruction* BuildCallGetter(HValue* object,
                                 Handle<Map> map,
                                 Handle<JSFunction> getter,
                                 Handle<JSObject> holder);
   HInstruction* BuildLoadNamedMonomorphic(HValue* object,
                                           Handle<String> name,
                                           Property* expr,
                                           Handle<Map> map);
   HInstruction* BuildLoadKeyedGeneric(HValue* object, HValue* key);
-  HInstruction* BuildExternalArrayElementAccess(
+  ArrayInstruction* BuildExternalArrayElementAccess(
       HValue* external_elements,
       HValue* checked_key,
       HValue* val,
       HValue* dependency,
       ElementsKind elements_kind,
       bool is_store);
 
   void AddCheckMapsWithTransitions(HValue* object,
                                    Handle<Map> map);
 
@@ skipping 315 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_