Attempt to fix the linker issues by wrapping the template call with a helper

runtime/vm/raw_object_snapshot.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/native_entry.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
@@ skipping 43 matching lines @@
     classid_t class_id = reader->ReadClassIDValue();
 
     // Allocate class object of specified kind.
     if (Snapshot::IsFull(kind)) {
       cls = reader->NewClass(class_id);
     } else {
       if (class_id < kNumPredefinedCids) {
         ASSERT((class_id >= kInstanceCid) && (class_id <= kMirrorReferenceCid));
         cls = reader->isolate()->class_table()->At(class_id);
       } else {
-        cls = Class::New<Instance>(kIllegalCid);
+        cls = Class::NewInstanceClass();
       }
     }
     reader->AddBackRef(object_id, &cls, kIsDeserialized);
 
     // Set all non object fields.
     if (!RawObject::IsInternalVMdefinedClassId(class_id)) {
       // Instance size of a VM defined class is already set up.
       cls.set_instance_size_in_words(reader->Read<int32_t>());
       cls.set_next_field_offset_in_words(reader->Read<int32_t>());
     }
@@ skipping 3709 matching lines @@
     // We do not allow objects with native fields in an isolate message.
     writer->SetWriteException(Exceptions::kArgument,
                               "Illegal argument in isolate message"
                               " : (object is a UserTag)");
   } else {
     UNREACHABLE();
   }
 }
 
 }  // namespace dart