Fix for issue 21398 (only send "literal like" objects across isolates spawned using spawnURI

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/dart_api_message.h"
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
 #include "vm/symbols.h"
 #include "vm/unicode.h"
 
@@ skipping 590 matching lines @@
       while (i < len) {
         p += Utf8::Encode(Utf16::Next(utf16, &i, len), p);
       }
       *p = '\0';
       ASSERT(p == (object->value.as_string + utf8_len));
       ::free(utf16);
       return object;
     }
     case kSendPortCid: {
       int64_t value64 = Read<int64_t>();
+      int64_t originId = Read<uint64_t>();
       Dart_CObject* object = AllocateDartCObject(Dart_CObject_kSendPort);
-      object->value.as_send_port = value64;
+      object->value.as_send_port.id = value64;
+      object->value.as_send_port.origin_id = originId;
       AddBackRef(object_id, object, kIsDeserialized);
       return object;
     }
 
 #define READ_TYPED_DATA_HEADER(type)                                           \
       intptr_t len = ReadSmiValue();                                           \
       Dart_CObject* object =                                                   \
           AllocateDartCObjectTypedData(Dart_TypedData_k##type, len);           \
       AddBackRef(object_id, object, kIsDeserialized);                          \
 
@@ skipping 598 matching lines @@
     if (!success) {
       UnmarkAllCObjects(object);
       return false;
     }
   }
   UnmarkAllCObjects(object);
   return true;
 }
 
 }  // namespace dart