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 111358d7507d378474ce2de88ef9a2346c04c798..fd2f73cf00b7801afc6a081bae6d2c8748014dc7 100644
--- a/sdk/lib/_internal/compiler/implementation/enqueue.dart
+++ b/sdk/lib/_internal/compiler/implementation/enqueue.dart
@@ -226,10 +226,9 @@ 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);
@@ -253,6 +252,11 @@ class Enqueuer {
           });
         }
       }
+      processClass(cls);
+      for (Link<DartType> supertypes = cls.allSupertypes;
+           !supertypes.isEmpty; supertypes = supertypes.tail) {
+        processClass(supertypes.head.element);
+      }
     });
   }