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/dart2jslib.dart"
     hide TreeElementMapping, TreeElements, SourceString;
 import "../../../lib/compiler/implementation/resolution/resolution.dart";
 import "../../../lib/compiler/implementation/elements/elements.dart";
@@ skipping 712 matching lines @@
          class double {}
          class bool {}
          class String {}
          class num {}
          class Function {}
          class List {}
          class Map {}
          class Closure {}
          class Null {}
          class Dynamic_ {}
+         class Type {}
          class Object { Object() : super(); }''';
   resolveConstructor(script, "Object o = new Object();", "Object", "", 1,
                      expectedWarnings: [],
                      expectedErrors: [MessageKind.SUPER_INITIALIZER_IN_OBJECT],
                      corelib: CORELIB_WITH_INVALID_OBJECT);
 }
 
 map(ResolverVisitor visitor) {
   TreeElementMapping elements = visitor.mapping;
   return elements.map;
@@ skipping 63 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));
 }