Revert "Enqueue superclasses instead of supertypes."

pkg/compiler/lib/src/ssa/nodes.dart

 // 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.
 
 part of ssa;
 
 abstract class HVisitor<R> {
   R visitAdd(HAdd node);
   R visitAwait(HAwait node);
   R visitBitAnd(HBitAnd node);
@@ skipping 887 matching lines @@
       ClassWorld classWorld) {
     return classWorld.isInstantiated(cls) &&
         typeMask.containsOnly(cls);
   }
 
   /// Returns `true` if [typeMask] is an instance of [cls].
   static bool isInstanceOf(
       TypeMask typeMask,
       ClassElement cls,
       ClassWorld classWorld) {
-    return classWorld.isImplemented(cls) &&
+    return classWorld.isInstantiated(cls) &&
         typeMask.satisfies(cls, classWorld);
   }
 
   bool canBePrimitive(Compiler compiler) {
     return canBePrimitiveNumber(compiler)
         || canBePrimitiveArray(compiler)
         || canBePrimitiveBoolean(compiler)
         || canBePrimitiveString(compiler)
         || isNull();
   }
@@ skipping 2406 matching lines @@
 class HDynamicType extends HRuntimeType {
   HDynamicType(DynamicType dartType, TypeMask instructionType)
       : super(const <HInstruction>[], dartType, instructionType);
 
   accept(HVisitor visitor) => visitor.visitDynamicType(this);
 
   int typeCode() => HInstruction.DYNAMIC_TYPE_TYPECODE;
 
   bool typeEquals(HInstruction other) => other is HDynamicType;
 }