Transitioning stores change maps.

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_INSTRUCTIONS_H_
 #define V8_HYDROGEN_INSTRUCTIONS_H_
 
 #include "v8.h"
 
 #include "allocation.h"
@@ skipping 6708 matching lines @@
           HConstant::cast(transition())->handle(Isolate::Current()));
     } else {
       return Handle<Map>();
     }
   }
 
   void SetTransition(HConstant* transition) {
     ASSERT(!has_transition());  // Only set once.
     SetOperandAt(2, transition);
     has_transition_ = true;
+    SetChangesFlag(kMaps);
   }
 
   bool NeedsWriteBarrier() {
     ASSERT(!field_representation().IsDouble() || !has_transition());
     if (field_representation().IsDouble()) return false;
     if (field_representation().IsSmi()) return false;
     if (field_representation().IsInteger32()) return false;
     if (field_representation().IsExternal()) return false;
     return StoringValueNeedsWriteBarrier(value()) &&
         ReceiverObjectNeedsWriteBarrier(object(), value(),
@@ skipping 972 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_