diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug909601.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug909601.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// |jit-test| ion-eager
+for (var i=0; i<3; i++)
+    z = new Int32Array;
+
+function f() {
+    z.__proto__ = 2;
+}
+
+for (var i=0; i<3; i++)
+    f();