enable --dump-info with the --fast-startup emitter

pkg/compiler/lib/src/io/code_output.dart

Index: pkg/compiler/lib/src/io/code_output.dart
diff --git a/pkg/compiler/lib/src/io/code_output.dart b/pkg/compiler/lib/src/io/code_output.dart
index e43cbbbfa4cf0c115b574edd5d0bf7968fdf70b7..674bef35c27df6df342780542b22740cf6a475cf 100644
--- a/pkg/compiler/lib/src/io/code_output.dart
+++ b/pkg/compiler/lib/src/io/code_output.dart
@@ -39,7 +39,7 @@ abstract class CodeOutput implements SourceLocations {
   /// If the output is closed, a [StateError] is thrown.
   void addBuffer(CodeBuffer buffer);
 
-  /// Returns the number of characters currently write to this output.
+  /// Returns the number of characters currently written to this output.
   int get length;
 
   /// Returns `true` if this output has been closed.