Adds an assertion to limit snapshot intptr_t size.

runtime/vm/dart_api_message.cc

 // 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.
 
 #include "vm/bigint_operations.h"
 #include "vm/dart_api_message.h"
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
 #include "vm/symbols.h"
 #include "vm/unicode.h"
@@ skipping 1136 matching lines @@
       if (length < 0 ||
           length > ExternalTypedData::MaxElements(
               kExternalTypedDataUint8ArrayCid)) {
         return false;
       }
       uint8_t* data = object->value.as_external_typed_data.data;
       void* peer = object->value.as_external_typed_data.peer;
       Dart_WeakPersistentHandleFinalizer callback =
           object->value.as_external_typed_data.callback;
       WriteSmi(length);
-      WriteIntptrValue(reinterpret_cast<intptr_t>(data));
-      WriteIntptrValue(reinterpret_cast<intptr_t>(peer));
-      WriteIntptrValue(reinterpret_cast<intptr_t>(callback));
+      WriteRawPointerValue(reinterpret_cast<intptr_t>(data));
+      WriteRawPointerValue(reinterpret_cast<intptr_t>(peer));
+      WriteRawPointerValue(reinterpret_cast<intptr_t>(callback));
       break;
     }
     default:
       UNREACHABLE();
   }
 
   return true;
 }
 
 
@@ skipping 11 matching lines @@
     if (!success) {
       UnmarkAllCObjects(object);
       return false;
     }
   }
   UnmarkAllCObjects(object);
   return true;
 }
 
 }  // namespace dart