Prototype of mark-and-compact support for Harmony weak maps.

test/mjsunit/harmony/weakmaps.js

Index: test/mjsunit/harmony/weakmaps.js
diff --git a/test/mjsunit/harmony/weakmaps.js b/test/mjsunit/harmony/weakmaps.js
index d17f4dd255c7f7870e6de917b71490f1f29b6f38..8cbf213abc6dc59c27f9d52009e662f1982ab4c7 100644
--- a/test/mjsunit/harmony/weakmaps.js
+++ b/test/mjsunit/harmony/weakmaps.js
@@ -107,3 +107,14 @@ var m = new WeakMap;
 assertTrue(m instanceof WeakMap);
 assertTrue(WeakMap.prototype.set instanceof Function)
 assertTrue(WeakMap.prototype.get instanceof Function)
+
+
+// Stress Test
+// https://mail.mozilla.org/pipermail/es-discuss/2011-May/014096.html
+/*var wm = new WeakMap;
+var key = {}, value = {};
+while(true) {
+  wm.set(key, value);
+  key = value;
+  value = {};
+}*/