Add regression test for Map compaction issue.

tests/standalone/map_literal_oom_test.dart

Index: tests/standalone/map_literal_oom_test.dart
===================================================================
--- tests/standalone/map_literal_oom_test.dart	(revision 0)
+++ tests/standalone/map_literal_oom_test.dart	(working copy)
@@ -0,0 +1,14 @@
+// Copyright (c) 2015, 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.
+//
+// VMOptions=--old_gen_heap_size=10
+// Test that compaction does occur on repeated add/remove.
+
+main() {
+  var x = {};
+  for (int i = 0; i < 1000000000; i++) {

[kustermann, 2015/03/25 09:19:26]

You could remove two '0's, since the test might time out on some architectures
otherwise (mips/arm simulator/hardware are pretty slow I think).

[koda, 2015/03/25 22:26:35]

Done.

+    x[i] = 10;
+    x.remove(i);
+  }
+}