diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug786107.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug786107.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+function writeHeaderToLog( string ) {}
+writeHeaderToLog(-0, this);
+gczeal(4);
+writeHeaderToLog(0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,
+           0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,
+           0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,
+           0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,
+           0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,
+           0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,
+           0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9);