Add issue numbers to language tests status files

tests/language/store_to_load_forwarding_phis_vm_test.dart

-// Copyright (c) 2013, 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.
-// Test correct handling of phis with only environment uses that were inserted
-// by store to load forwarding.
-// VMOptions=--optimization_counter_threshold=100
-
-library store_to_load_forwarding_phis_vm_test;
-
-import 'dart:async';
-
-class A {
-  var _foo;
-
-  get foo {
-    if (_foo == null) {
-      _foo = new A();
-    }
-    return _foo;
-  }
-}
-
-foo(obj) {
-  var a = obj.foo;
-  return new Future.value().then((val) { });
-}
-
-main() {
-  final obj = new A();
-  for (var i = 0; i < 200; i++) {
-    foo(obj);
-  }
-}