fixes detection of SDK libraries

tool/input_sdk/private/foreign_helper.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.
 
-library _foreign_helper;
+library dart._foreign_helper;
 
 /**
  * Emits a JavaScript code fragment parameterized by arguments.
  *
  * Hash characters `#` in the [codeTemplate] are replaced in left-to-right order
  * with expressions that contain the values of, or evaluate to, the arguments.
  * The number of hash marks must match the number or arguments.  Although
  * declared with arguments [arg0] through [arg2], the form actually has no limit
  * on the number of arguments.
  *
@@ skipping 271 matching lines @@
 }
 
 /**
  * JavaScript string concatenation. Inputs must be Strings.  Corresponds to the
  * HStringConcat SSA instruction and may be constant-folded.
  */
 String JS_STRING_CONCAT(String a, String b) {
   // This body is unused, only here for type analysis.
   return JS('String', '# + #', a, b);
 }