Move the canonical empty context to the VM isolate.

runtime/vm/object_store.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object_store.h"
 
 #include "vm/exceptions.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 65 matching lines @@
       typed_data_library_(Library::null()),
       _vmservice_library_(Library::null()),
       libraries_(GrowableObjectArray::null()),
       libraries_map_(Array::null()),
       closure_functions_(GrowableObjectArray::null()),
       pending_classes_(GrowableObjectArray::null()),
       pending_deferred_loads_(GrowableObjectArray::null()),
       resume_capabilities_(GrowableObjectArray::null()),
       exit_listeners_(GrowableObjectArray::null()),
       error_listeners_(GrowableObjectArray::null()),
-      empty_context_(Context::null()),
       stack_overflow_(Instance::null()),
       out_of_memory_(Instance::null()),
       preallocated_unhandled_exception_(UnhandledException::null()),
       preallocated_stack_trace_(StackTrace::null()),
       lookup_port_handler_(Function::null()),
       empty_uint32_array_(TypedData::null()),
       handle_message_function_(Function::null()),
       simple_instance_of_function_(Function::null()),
       simple_instance_of_true_function_(Function::null()),
       simple_instance_of_false_function_(Function::null()),
@@ skipping 214 matching lines @@
   simple_instance_of_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOf());
   simple_instance_of_true_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOfTrue());
   simple_instance_of_false_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOfFalse());
 #endif
 }
 
 }  // namespace dart