Canonicalize raw type

sdk/lib/_internal/compiler/implementation/enqueue.dart

Index: sdk/lib/_internal/compiler/implementation/enqueue.dart
diff --git a/sdk/lib/_internal/compiler/implementation/enqueue.dart b/sdk/lib/_internal/compiler/implementation/enqueue.dart
index f12d760f68034e9fd357ff8590e7812dd2510502..65d134cbb548a1cf8b83a2aac0faba17c2714a23 100644
--- a/sdk/lib/_internal/compiler/implementation/enqueue.dart
+++ b/sdk/lib/_internal/compiler/implementation/enqueue.dart
@@ -228,10 +228,9 @@ class Enqueuer {
       // supertypes.
       cls.ensureResolved(compiler);
 
-      for (Link<DartType> supertypes = cls.allSupertypesAndSelf;
-           !supertypes.isEmpty; supertypes = supertypes.tail) {
-        cls = supertypes.head.element;
-        if (seenClasses.contains(cls)) continue;
+      void processClass(ClassElement cls) {
+        if (seenClasses.contains(cls)) return;
+
         seenClasses.add(cls);
         cls.ensureResolved(compiler);
         cls.implementation.forEachMember(processInstantiatedClassMember);
@@ -255,6 +254,11 @@ class Enqueuer {
           });
         }
       }
+      processClass(cls);
+      for (Link<DartType> supertypes = cls.allSupertypes;
+           !supertypes.isEmpty; supertypes = supertypes.tail) {
+        processClass(supertypes.head.element);
+      }
     });
   }