Also eliminate map checks with transitions.

src/hydrogen-instructions.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 2732 matching lines @@
                          HValue *typecheck = NULL) {
     HCheckMaps* check_map = new(zone) HCheckMaps(value, zone, typecheck);
     for (int i = 0; i < maps->length(); i++) {
       check_map->map_set_.Add(maps->at(i), zone);
     }
     check_map->map_set_.Sort();
     return check_map;
   }
 
   static HCheckMaps* NewWithTransitions(HValue* value, Handle<Map> map,
-                                        Zone* zone) {
-    HCheckMaps* check_map = new(zone) HCheckMaps(value, zone, value);
-    check_map->map_set_.Add(map, zone);
-
-    // Since transitioned elements maps of the initial map don't fail the map
-    // check, the CheckMaps instruction doesn't need to depend on ElementsKinds.
-    check_map->ClearGVNFlag(kDependsOnElementsKind);
-
-    ElementsKind kind = map->elements_kind();
-    bool packed = IsFastPackedElementsKind(kind);
-    while (CanTransitionToMoreGeneralFastElementsKind(kind, packed)) {
-      kind = GetNextMoreGeneralFastElementsKind(kind, packed);
-      Map* transitioned_map =
-          map->LookupElementsTransitionMap(kind);
-      if (transitioned_map) {
-        check_map->map_set_.Add(Handle<Map>(transitioned_map), zone);
-      }
-    };
-    check_map->map_set_.Sort();
-    return check_map;
-  }
+                                        Zone* zone, CompilationInfo* info);
 
   bool CanOmitMapChecks() { return omit_; }
 
   virtual bool HasEscapingOperandAt(int index) { return false; }
   virtual Representation RequiredInputRepresentation(int index) {
     return Representation::Tagged();
   }
   virtual void HandleSideEffectDominator(GVNFlag side_effect,
                                          HValue* dominator);
   virtual void PrintDataTo(StringStream* stream);
@@ skipping 3929 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_