Typecheck const classes in the context of the constructor call.

tests/compiler/dart2js/compiler_helper.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.
 
 library compiler_helper;
 
 import 'dart:async';
 import "package:expect/expect.dart";
 
 import 'package:compiler/compiler.dart' as api;
@@ skipping 78 matching lines @@
 }
 
 // TODO(herhut): Disallow warnings and errors during compilation by default.
 MockCompiler compilerFor(String code, Uri uri,
                          {bool analyzeAll: false,
                           bool analyzeOnly: false,
                           Map<String, String> coreSource,
                           bool disableInlining: true,
                           bool minify: false,
                           bool trustTypeAnnotations: false,
+                          bool enableTypeAssertions: false,
                           int expectedErrors,
                           int expectedWarnings,
                           api.CompilerOutputProvider outputProvider}) {
   MockCompiler compiler = new MockCompiler.internal(
       analyzeAll: analyzeAll,
       analyzeOnly: analyzeOnly,
       coreSource: coreSource,
       disableInlining: disableInlining,
       enableMinification: minify,
       trustTypeAnnotations: trustTypeAnnotations,
+      enableTypeAssertions: enableTypeAssertions,
       expectedErrors: expectedErrors,
       expectedWarnings: expectedWarnings,
       outputProvider: outputProvider);
   compiler.registerSource(uri, code);
   compiler.diagnosticHandler = createHandler(compiler, code);
   return compiler;
 }
 
 Future<String> compileAll(String code,
                           {Map<String, String> coreSource,
@@ skipping 142 matching lines @@
     regexp = regexp.replaceAll(xRe, '(?:$anyIdentifier)');
     final spaceRe = new RegExp('\\s+');
     regexp = regexp.replaceAll(spaceRe, '(?:\\s*)');
     if (shouldMatch) {
       Expect.isTrue(new RegExp(regexp).hasMatch(generated));
     } else {
       Expect.isFalse(new RegExp(regexp).hasMatch(generated));
     }
   });
 }