Revert "Implement substitution for type variables."

sdk/lib/_internal/compiler/implementation/ssa/codegen.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;
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
@@ skipping 2345 matching lines @@
       attachLocationToLast(node);
     } else if (types[input].canBePrimitive() || types[input].canBeNull()) {
       checkObject(input, '===');
       js.Expression objectTest = pop();
       checkType(input, type);
       push(new js.Binary('&&', objectTest, pop()), node);
     } else {
       checkType(input, type);
       attachLocationToLast(node);
     }
-    if (node.hasArgumentsCheck()) {
+    if (node.hasArgumentChecks()) {
       InterfaceType interfaceType = type;
       ClassElement cls = type.element;
       Link<DartType> arguments = interfaceType.typeArguments;
       js.Expression result = pop();
-      use(node.checkCall);
-      result = new js.Binary('&&', result, pop());
+      for (int i = 0; i < node.checkCount; i++) {
+        use(node.getCheck(i));
+        result = new js.Binary('&&', result, pop());
+      }
       push(result, node);
     }
     if (node.nullOk) {
       checkNull(input);
       push(new js.Binary('||', pop(), pop()), node);
     }
   }
 
   // TODO(johnniwinther): Refactor this method.
   void visitTypeConversion(HTypeConversion node) {
@@ skipping 618 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }