Enable on stack reload in standalone embedder

runtime/vm/object_reload.cc

Index: runtime/vm/object_reload.cc
diff --git a/runtime/vm/object_reload.cc b/runtime/vm/object_reload.cc
index 405854db24770010541fb867e141835677a1248f..2a49fc2915d1ec9a3caff26d5b2beeca19cbf85f 100644
--- a/runtime/vm/object_reload.cc
+++ b/runtime/vm/object_reload.cc
@@ -423,6 +423,9 @@ bool Class::CanReload(const Class& replacement) const {
     TIR_Print("Finalized replacement class for %s\n", ToCString());
   }
 
+  // At this point the original and replacement must be in the same state.
+  ASSERT(is_finalized() == replacement.is_finalized());
+
   if (is_finalized()) {
     // Get the field maps for both classes. These field maps walk the class
     // hierarchy.