Fix Harmony sets and maps to allow undefined as keys.

test/mjsunit/harmony/collections.js

Index: test/mjsunit/harmony/collections.js
diff --git a/test/mjsunit/harmony/collections.js b/test/mjsunit/harmony/collections.js
index d3c6c0f258030474dc717b27997c74c064630870..4b435c16141b01c50bb3ca7233b053261d9ef919 100644
--- a/test/mjsunit/harmony/collections.js
+++ b/test/mjsunit/harmony/collections.js
@@ -73,10 +73,15 @@ function TestSet(set, key) {
 function TestSetBehavior(set) {
   for (var i = 0; i < 20; i++) {
     TestSet(set, new Object);
+    TestSet(set, i);
+    TestSet(set, i / 100);
+    TestSet(set, 'key-' + i);
+  }
+  var keys = [ +0, -0, +Infinity, -Infinity, true, false, null, undefined ];
+  for (var i = 0; i < keys.length; i++) {
+    TestSet(set, keys[i]);
   }
 }
-TestSet(new Set, 23);
-TestSet(new Set, 'foo');
 TestSetBehavior(new Set);
 
 
@@ -101,7 +106,7 @@ function TestMapBehavior2(m) {
     TestMapping(m, i / 10, new Object);
     TestMapping(m, 'key-' + i, new Object);
   }
-  var keys = [ +0, -0, +Infinity, -Infinity, true, false, null ];
+  var keys = [ +0, -0, +Infinity, -Infinity, true, false, null, undefined ];
   for (var i = 0; i < keys.length; i++) {
     TestMapping(m, keys[i], new Object);
   }