diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug755639.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug755639.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+// Binary: cache/js-dbg-64-bfc259be3fa2-linux
+// Flags: -m -n -a
+//
+
+if (typeof gcPreserveCode != "function") {
+    function gcPreserveCode() {}
+}
+
+if (typeof gcslice != "function") {
+    function gcslice() {}
+}
+
+function f(t)
+{
+    for (var i = 0; i < 1; ++i) {
+        if (typeof(t) != "string") {
+        }
+    }
+}
+function m(d)
+{
+    if (d == 0)
+        return "";
+    f(m(d - 1));
+}
+m(1);
+gcPreserveCode();
+try {
+  mjitChunkLimit(1);
+} catch(exc1) {}
+gcslice(0);
+m(1);
+gc();
+m(2);