Heap profiler: account primitive string objects as being constructed using 'String'.

src/objects.h

 // Copyright 2006-2009 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 1374 matching lines @@
 
   // Sets a property that currently has lazy loading.
   Object* SetLazyProperty(LookupResult* result,
                           String* name,
                           Object* value,
                           PropertyAttributes attributes);
 
   // Returns the class name ([[Class]] property in the specification).
   String* class_name();
 
+  // Returns the constructor name (the name (possibly, inferred name) of the
+  // function that was used to instantiate the object).
+  String* constructor_name();
+
   // Retrieve interceptors.
   InterceptorInfo* GetNamedInterceptor();
   InterceptorInfo* GetIndexedInterceptor();
 
   inline PropertyAttributes GetPropertyAttribute(String* name);
   PropertyAttributes GetPropertyAttributeWithReceiver(JSObject* receiver,
                                                       String* name);
   PropertyAttributes GetLocalPropertyAttribute(String* name);
 
   Object* DefineAccessor(String* name, bool is_getter, JSFunction* fun,
@@ skipping 3456 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_