dart2js: add type lookup in the new emitter.

sdk/lib/_internal/compiler/js_lib/js_helper.dart

 // Copyright (c) 2013, 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 _js_helper;
 
 import 'dart:_js_embedded_names' show
-    ALL_CLASSES,
+    GET_TYPE_FROM_NAME,
     GET_ISOLATE_TAG,
     INTERCEPTED_NAMES,
     INTERCEPTORS_BY_TAG,
     LEAF_TAGS,
     METADATA,
     DEFERRED_LIBRARY_URIS,
     DEFERRED_LIBRARY_HASHES,
     INITIALIZE_LOADED_HUNK,
     IS_HUNK_LOADED,
     IS_HUNK_INITIALIZED,
@@ skipping 3122 matching lines @@
         "'${JS('String', 'JSON.stringify(#)', rti)}' to RuntimeType.");
   }
 }
 
 class RuntimeTypePlain extends RuntimeType {
   final String name;
 
   RuntimeTypePlain(this.name);
 
   toRti() {
-    var allClasses = JS_EMBEDDED_GLOBAL('', ALL_CLASSES);
-    var rti = JS('', '#[#]', allClasses, name);
+    var getTypeFromName = JS_EMBEDDED_GLOBAL('', GET_TYPE_FROM_NAME);
+    var rti = JS('', '#(#)', getTypeFromName, name);
     if (rti == null) throw "no type for '$name'";
     return rti;
   }
 
   String toString() => name;
 }
 
 class RuntimeTypeGeneric extends RuntimeType {
   final String name;
   final List<RuntimeType> arguments;
   var rti;
 
   RuntimeTypeGeneric(this.name, this.arguments, this.rti);
 
   toRti() {
     if (rti != null) return rti;
-    var allClasses = JS_EMBEDDED_GLOBAL('', ALL_CLASSES);
-    var result = JS('JSExtendableArray', '[#[#]]', allClasses, name);
+    var getTypeFromName = JS_EMBEDDED_GLOBAL('', GET_TYPE_FROM_NAME);
+    var result = JS('JSExtendableArray', '[#(#)]', getTypeFromName, name);
     if (result[0] == null) {
       throw "no type for '$name<...>'";
     }
     for (RuntimeType argument in arguments) {
       JS('', '#.push(#)', result, argument.toRti());
     }
     return rti = result;
   }
 
   String toString() => '$name<${arguments.join(", ")}>';
@@ skipping 274 matching lines @@
   throw new MainError("No top-level function named 'main'.");
 }
 
 void badMain() {
   throw new MainError("'main' is not a function.");
 }
 
 void mainHasTooManyParameters() {
   throw new MainError("'main' expects too many parameters.");
 }