Replace 'the the' with 'the'

pkg/kernel/lib/transformations/async.dart

Index: pkg/kernel/lib/transformations/async.dart
diff --git a/pkg/kernel/lib/transformations/async.dart b/pkg/kernel/lib/transformations/async.dart
index 352b4168c4c7828a42483e7b5e3ab400acac802c..526bab461235daf3e55f2ce9b7d349be336e7e67 100644
--- a/pkg/kernel/lib/transformations/async.dart
+++ b/pkg/kernel/lib/transformations/async.dart
@@ -457,7 +457,7 @@ class ExpressionLifter extends Transformer {
       //
       // 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);