In upstream this patch has only been applied to the master branch and hasn't been included in any other branches yet. We've sent the backported patch to the upstream binutils-2_44 branch, but they seem hesitant to merge it into the stable branches.
"I deliberately left that patch off the branch, and even now after it has had some time for potential problems to show up I don't think it
warrants backporting. Memory leaks of this nature hardly qualify as bugs."