Suspend after async generator terminates

tests/language/language_dart2js.status

 # Copyright (c) 2012, 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.
 
 [ $compiler == dart2js ]
 sync_generator2_test/07: MissingCompileTimeError # Issue 22324
 sync_generator2_test/08: MissingCompileTimeError # Issue 22324
 sync_generator2_test/10: MissingCompileTimeError # Issue 22324
 
 [ $compiler == dart2js && $runtime == jsshell ]
@@ skipping 157 matching lines @@
 round_test: Pass, Fail, OK # Fixed in ff 35. Common JavaScript engine Math.round bug.
 
 [ $compiler == dart2js && ($runtime == safari || $runtime == safarimobilesim)]
 # Safari codegen bug, fixed on some versions of Safari 7.1 (Version 7.1 (9537.85.10.17.1))
 call_through_getter_test: Fail, OK
 
 [ $compiler == dart2js && $runtime == chromeOnAndroid ]
 override_field_test/02: Pass, Slow # TODO(kasperl): Please triage.
 
 [ $compiler == dart2dart && $builder_tag == new_backend ]
-asyncstar_throw_in_catch_test: RuntimeError # Issue 21404
 regress_13494_test: Pass # Issue 22370, passes for the wrong reason
 
 [ $compiler == dart2dart && $builder_tag == new_backend && $host_checked ]
 large_implicit_getter_test: Crash # Stack overflow
 
 [ $compiler == dart2dart && $builder_tag == new_backend && $minified == true ]
 # This test fails in minified, because the type-argument is
 # renamed, but the symbol naming it it is not.
 type_variable_conflict2_test/01: RuntimeError # Issue 16180
 
@@ skipping 74 matching lines @@
 invocation_mirror_test: Fail, OK # Issue 12706 (hardcoded names).
 super_call4_test: Fail, OK # hardcoded names.
 
 [ $minified ]
 stack_trace_test: Fail, OK # Stack trace not preserved in minified code.
 regress_21795_test: RuntimeError # Issue 12605
 
 [ $compiler == dart2js && $runtime == d8 && $system == windows ]
 *deferred*: Skip # Issue 17458
 cha_deopt*: Skip # Issue 17458