Clean up package imports and library names

pkg/analyzer/lib/src/generated/utilities_general.dart

 // Copyright (c) 2014, 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 engine.utilities.general;
+library analyzer.src.generated.utilities_general;
 
 import 'dart:collection';
 import 'dart:developer' show UserTag;
 
 /**
  * Test if the given [value] is `true` or the string "true" (case-insensitive).
  */
 bool isTrue(Object value) =>
     value is bool ? value : toLowerCase(value) == 'true';
 
@@ skipping 168 matching lines @@
 
   makeCurrentWhile(f()) {
     PerformanceTag prevTag = makeCurrent();
     try {
       return f();
     } finally {
       prevTag.makeCurrent();
     }
   }
 }