Support class and typedef literals as expressions.

tests/compiler/dart2js/resolver_test.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.
 
 #import('dart:uri');
 
 #import("../../../lib/compiler/implementation/leg.dart");
 #import("../../../lib/compiler/implementation/elements/elements.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 #import("../../../lib/compiler/implementation/scanner/scannerlib.dart");
@@ skipping 689 matching lines @@
          class int {}
          class double {}
          class bool {}
          class String {}
          class num {}
          class Function {}
          class List {}
          class Closure {}
          class Null {}
          class Dynamic_ {}
+         class Type {}
          class Object { Object() : super(); }''';
   resolveConstructor(script, "Object o = new Object();", "Object", "Object", 1,
                      [], [MessageKind.SUPER_INITIALIZER_IN_OBJECT],
                      corelib: CORELIB_WITH_INVALID_OBJECT);
 }
 
 map(ResolverVisitor visitor) {
   TreeElementMapping elements = visitor.mapping;
   return elements.map;
 }
@@ skipping 62 matching lines @@
         var d = new D();
         --d;
       }""";
   final compiler = compileScript(script);
 
   checkMemberResolved(compiler, 'A', operatorName('+', false));
   checkMemberResolved(compiler, 'B', operatorName('+', false));
   checkMemberResolved(compiler, 'C', operatorName('-', false));
   checkMemberResolved(compiler, 'D', operatorName('-', false));
 }