unfork DDC's copy of most SDK libraries

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart

 // Copyright (c) 2015, 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.
 
 /// This library defines runtime operations on objects used by the code
 /// generator.
 part of dart._runtime;
 
 class InvocationImpl extends Invocation {
   final Symbol memberName;
@@ skipping 190 matching lines @@
           case '_constructor':
           case '_prototype':
             return $name.substring(1);
         }
       }
       return $name;
   })()''');
 
 Symbol _dartSymbol(name) {
   return (JS('bool', 'typeof # === "symbol"', name))
-      ? JS('', '#(new #.es6(#, #))', const_, _internal.Symbol,
+      ? JS('', '#(new #(#, #))', const_, _internal.PrivateSymbol,
           _toSymbolName(name), name)
       : JS('', '#(#.new(#))', const_, Symbol, _toDisplayName(name));
 }
 
 /// Extracts the named argument array from a list of arguments, and returns it.
 // TODO(jmesserly): we need to handle named arguments better.
 extractNamedArgs(args) {
   if (JS('bool', '#.length > 0', args)) {
     var last = JS('', '#[#.length - 1]', args, args);
     if (JS(
@@ skipping 745 matching lines @@
     name = '+' + name;
   }
   return name;
 }
 
 /// Emulates the implicit "loadLibrary" function provided by a deferred library.
 ///
 /// Libraries are not actually deferred in DDC, so this just returns a future
 /// that completes immediately.
 Future loadLibrary() => new Future.value();