Add 'part of' in dart2js code.

lib/compiler/implementation/ssa/js_names.dart

 // Copyright (c) 2011, 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 ssa;
+
 class JsNames {
   static const javaScriptKeywords = const <String>[
     // These are current keywords
     "break", "delete", "function", "return", "typeof", "case", "do", "if",
     "switch", "var", "catch", "else", "in", "this", "void", "continue",
     "false", "instanceof", "throw", "while", "debugger", "finally", "new",
     "true", "with", "default", "for", "null", "try",
 
     // These are future keywords
     "abstract", "double", "goto", "native", "static", "boolean", "enum",
@@ skipping 159 matching lines @@
   static String getValid(String name) {
     if (reserved.contains(name)) {
       name = '$name\$';
       assert(!reserved.contains(name));
     } else if (name.contains(r'$')) {
       name = name.replaceAll(r'$', r'$$');
     }
     return name;
   }
 }