Fix status file for flatten_test in dart2dart.

tests/language/language_dart2js.status

Index: tests/language/language_dart2js.status
diff --git a/tests/language/language_dart2js.status b/tests/language/language_dart2js.status
index df39ad5df7e2323f084e2262d70dfc34b72cdc99..b542da1328dd27bd57a4dbd641d30cc025ad0c01 100644
--- a/tests/language/language_dart2js.status
+++ b/tests/language/language_dart2js.status
@@ -59,6 +59,15 @@ ref_before_declaration_test/04: MissingCompileTimeError
 ref_before_declaration_test/05: MissingCompileTimeError
 ref_before_declaration_test/06: MissingCompileTimeError
 
+flatten_test/05: Crash # Issue 22921
+flatten_test/06: Crash # Issue 22921
+flatten_test/07: Crash # Issue 22921
+flatten_test/08: Crash # Issue 22921
+flatten_test/09: Crash # Issue 22921
+flatten_test/10: Crash # Issue 22921
+flatten_test/11: Crash # Issue 22921
+flatten_test/12: Crash # Issue 22921
+
 
 # VM specific tests that should not be run by dart2js.
 vm/*: Skip # Issue 12699
@@ -114,14 +123,6 @@ malformed_test/none: Fail # Expect failure in lib/_internal/compiler/js_lib/prea
 generic_field_mixin4_test: Crash # Issue 18651
 generic_field_mixin5_test: Crash # Issue 18651
 flatten_test/04: Skip # Issue 22922
-flatten_test/05: Crash # Issue 22921
-flatten_test/06: Crash # Issue 22921
-flatten_test/07: Crash # Issue 22921
-flatten_test/08: Crash # Issue 22921
-flatten_test/09: Crash # Issue 22921
-flatten_test/10: Crash # Issue 22921
-flatten_test/11: Crash # Issue 22921
-flatten_test/12: Crash # Issue 22921
 
 type_variable_conflict2_test/01: RuntimeError # Issue 19725