Replace 'the the' with 'the'

pkg/kernel/lib/transformations/async.dart

 // Copyright (c) 2016, 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 kernel.transformations.async;
 
 import '../kernel.dart';
 import 'continuation.dart';
 
 /// A transformer that introduces temporary variables for all subexpressions
@@ skipping 439 matching lines @@
       // will produce the sequence of statements:
       //
       // <initializer's statements>
       // var x = <initializer's value>
       // <body's statements>
       //
       // and return the body's value.
       //
       // So x is in scope for all the body's statements and the body's value.
       // This has the unpleasant consequence that all let-bound variables with
-      // await in the let's body will end up hoisted out the the expression and
+      // await in the let's body will end up hoisted out of the expression and
       // allocated to the context in the VM, even if they have no uses
       // (`let _ = e0 in e1` can be used for sequencing of `e0` and `e1`).
       statements.add(variable);
       var index = nameIndex;
       seenAwait = false;
       variable.initializer = variable.initializer.accept(this)
         ..parent = variable;
       // Temporaries used in the initializer or the body are not live but the
       // temporary used for the body is.
       nameIndex = index + 1;
@@ skipping 11 matching lines @@
       });
     }
   }
 
   visitFunctionNode(FunctionNode node) {
     var nestedRewriter =
         new RecursiveContinuationRewriter(continuationRewriter.helper);
     return node.accept(nestedRewriter);
   }
 }