Move Null class out of the VM isolate.

runtime/vm/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/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
@@ skipping 452 matching lines @@
   obj->ptr()->num_variables_ = num_variables;
   return obj;
 }
 
 
 RawClass* SnapshotReader::NewClass(intptr_t class_id) {
   ASSERT(kind_ == Snapshot::kFull);
   ASSERT(isolate()->no_gc_scope_depth() != 0);
   if (class_id < kNumPredefinedCids) {
     ASSERT((class_id >= kInstanceCid) &&
-           (class_id <= kExternalTypedDataFloat32x4ArrayCid));
+           (class_id <= kNullCid));
     return isolate()->class_table()->At(class_id);
   }
   cls_ = Object::class_class();
   RawClass* obj = reinterpret_cast<RawClass*>(
       AllocateUninitialized(cls_, Class::InstanceSize()));
   Instance fake;
   obj->ptr()->handle_vtable_ = fake.vtable();
   cls_ = obj;
   cls_.set_id(kIllegalCid);
   isolate()->RegisterClass(cls_);
@@ skipping 989 matching lines @@
     UnmarkAll();
     isolate->set_long_jump_base(base);
   } else {
     isolate->set_long_jump_base(base);
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart