- Turn on canonicalization verification after a reload in debug mode.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index bf063f3ffe159961bc70fc0b7978785fd1a9ef6b..565842edef83d29ad4772cb481d142fb628c3988 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -4411,6 +4411,7 @@ typedef UnorderedHashSet <CanonicalInstanceTraits> CanonicalInstancesSet;
 RawInstance* Class::LookupCanonicalInstance(Zone* zone,
                                             const Instance& value) const {
   ASSERT(this->raw() == value.clazz());
+  ASSERT(is_finalized());
   Instance& canonical_value = Instance::Handle(zone);
   if (this->constants() != Object::empty_array().raw()) {
     CanonicalInstancesSet constants(zone, this->constants());