Read platform.dill in the VM.

runtime/vm/object_store.h

 // Copyright (c) 2012, 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.
 
 #ifndef RUNTIME_VM_OBJECT_STORE_H_
 #define RUNTIME_VM_OBJECT_STORE_H_
 
 #include "vm/object.h"
 
 namespace dart {
@@ skipping 275 matching lines @@
     name##_library_ = value.raw();                                             \
     break;
 
       FOR_EACH_BOOTSTRAP_LIBRARY(MAKE_CASE)
 #undef MAKE_CASE
       default:
         UNREACHABLE();
     }
   }
 
+  RawLibrary* builtin_library() const { return builtin_library_; }
   void set_builtin_library(const Library& value) {
     builtin_library_ = value.raw();
   }
 
   RawLibrary* native_wrappers_library() const {
     return native_wrappers_library_;
   }
   void set_native_wrappers_library(const Library& value) {
     native_wrappers_library_ = value.raw();
   }
@@ skipping 314 matching lines @@
 
   friend class Serializer;
   friend class Deserializer;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectStore);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OBJECT_STORE_H_