Use MarkIndependent in sample shell.

samples/shell.cc

 // Copyright 2011 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 486 matching lines @@
     return v8::ThrowException(
         v8::String::New("Array constructor needs one parameter."));
   }
   int length = args[0]->Int32Value();
   void* data = malloc(length * element_size);
   memset(data, 0, length * element_size);
   v8::Handle<v8::Object> array = v8::Object::New();
   v8::Persistent<v8::Object> persistent_array =
       v8::Persistent<v8::Object>::New(array);
   persistent_array.MakeWeak(data, ExternalArrayWeakCallback);
+  persistent_array.MarkIndependent();
   array->SetIndexedPropertiesToExternalArrayData(data, type, length);
   array->Set(v8::String::New("length"), v8::Int32::New(length),
              v8::ReadOnly);
   array->Set(v8::String::New("BYTES_PER_ELEMENT"),
              v8::Int32::New(element_size));
   return array;
 }
 
 
 v8::Handle<v8::Value> Int8Array(const v8::Arguments& args) {
@@ skipping 153 matching lines @@
       printf("^");
     }
     printf("\n");
     v8::String::Utf8Value stack_trace(try_catch->StackTrace());
     if (stack_trace.length() > 0) {
       const char* stack_trace_string = ToCString(stack_trace);
       printf("%s\n", stack_trace_string);
     }
   }
 }