Incremental compilation: correctly track emitted constants.

dart/tests/try/web/incremental_compilation_update_test.dart

Index: dart/tests/try/web/incremental_compilation_update_test.dart
diff --git a/dart/tests/try/web/incremental_compilation_update_test.dart b/dart/tests/try/web/incremental_compilation_update_test.dart
index fc9f238902a8218c158f9374a0b64dcdccb137b9..4acfc5eed787abc67cdccfc0acf3f6bf64fe7b17 100644
--- a/dart/tests/try/web/incremental_compilation_update_test.dart
+++ b/dart/tests/try/web/incremental_compilation_update_test.dart
@@ -1702,11 +1702,7 @@ main() {
   print(const A(const B('v2')));
 }
 """,
-            // TODO(ahe): Broken test, wrong output.
-            const <String>['B(null)', 'A(null)']),
-/* These are the correct expectations:
             const <String>['B(A(v2))', 'A(B(v2))']),
-*/
     ],
 
     // Test constants of new classes.