Add ParameterMirror.isInitializingFormal to dart:mirrors

pkg/compiler/lib/src/js_emitter/full_emitter/setup_program_builder.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.
 
 part of dart2js.js_emitter.full_emitter;
 
 // TODO(ahe): Share these with js_helper.dart.
 const FUNCTION_INDEX = 0;
 const NAME_INDEX = 1;
 const CALL_NAME_INDEX = 2;
@@ skipping 61 matching lines @@
           embeddedNames.INSTANCE_FROM_CLASS_ID);
 
   String reflectableField = namer.reflectableField;
   String reflectionInfoField = namer.reflectionInfoField;
   String reflectionNameField = namer.reflectionNameField;
   String metadataIndexField = namer.metadataIndexField;
   String defaultValuesField = namer.defaultValuesField;
   String methodsWithOptionalArgumentsField =
       namer.methodsWithOptionalArgumentsField;
   String unmangledNameIndex = backend.mustRetainMetadata
-      ? ' 3 * optionalParameterCount + 2 * requiredParameterCount + 3'
-      : ' 2 * optionalParameterCount + requiredParameterCount + 3';
+      ? ' 4 * optionalParameterCount + 3 * requiredParameterCount + 3'
+      : ' 3 * optionalParameterCount + 2 * requiredParameterCount + 3';
   String receiverParamName = compiler.enableMinification ? "r" : "receiver";
   String valueParamName = compiler.enableMinification ? "v" : "value";
   String space = compiler.enableMinification ? "" : " ";
   String _ = space;
 
   String specProperty = '"${namer.nativeSpecProperty}"';  // "%"
   jsAst.Expression nativeInfoAccess = js('prototype[$specProperty]', []);
   jsAst.Expression constructorAccess = js('constructor', []);
   Function subclassReadGenerator =
       (jsAst.Expression subclass) => js('allClasses[#]', subclass);
@@ skipping 754 matching lines @@
 (function() {
   var result = $array[$index];
   if ($check) {
     throw new Error(
         name + ": expected value of type \'$type\' at index " + ($index) +
         " but got " + (typeof result));
   }
   return result;
 })()''';
 }