Fix assert.

lib/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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
   final JavaScriptBackend backend;
   SsaCodeGeneratorTask(JavaScriptBackend backend)
       : this.backend = backend,
         super(backend.compiler);
   String get name() => 'SSA code generator';
@@ skipping 2527 matching lines @@
           checkInt(node.checkedInput, '!==');
         } else {
           assert(element == compiler.numClass);
           checkNum(node.checkedInput, '!==');
         }
         buffer.add(') ');
         generateThrowWithHelper('iae', node.checkedInput);
         return;
       }
 
-      assert(node.isCheckedModeCheck);
+      assert(node.isCheckedModeCheck || node.isCastTypeCheck);
       if (element == compiler.stringClass) {
         helper = const SourceString('stringTypeCheck');
       } else if (element == compiler.doubleClass) {
         helper = const SourceString('doubleTypeCheck');
       } else if (element == compiler.numClass) {
         helper = const SourceString('numTypeCheck');
       } else if (element == compiler.boolClass) {
         helper = const SourceString('boolTypeCheck');
       } else if (element == compiler.functionClass || element.isTypedef()) {
         helper = const SourceString('functionTypeCheck');
@@ skipping 475 matching lines @@
       startBailoutSwitch();
     }
   }
 
   void endLabeledBlock(HLabeledBlockInformation labeledBlockInfo) {
     if (labeledBlockInfo.body.start.hasGuards()) {
       endBailoutSwitch();
     }
   }
 }