Add assert to make sure that function refers to compiled code in handles.cc

src/compiler.h

 // Copyright 2006-2008 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 114 matching lines @@
                               int loop_nesting)
       : closure_(closure), loop_nesting_(loop_nesting) {
     ASSERT(!closure.is_null());
   }
 
   // Overridden functions from the base class.
   virtual Handle<SharedFunctionInfo> shared_info() const {
     return Handle<SharedFunctionInfo>(closure_->shared());
   }
 
+  virtual Handle<JSFunction> closure() const {
+    return closure_;
+  }
+
   virtual int loop_nesting() const { return loop_nesting_; }
 
   virtual bool has_global_object() const {
     return closure_->context()->global() != NULL;
   }
 
   virtual GlobalObject* global_object() const {
     return closure_->context()->global();
   }
 
@@ skipping 84 matching lines @@
       FrameElement::ClearConstantList();
       Result::ClearConstantList();
     }
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_