[Crash-utility] poisoned per_cpu data not handled on ppc64

[Olaf Hering]

We use this patch to catch incorrect access to per_cpu data. But crash
cant deal with it unfortunately.

http://patchwork.ozlabs.org/linuxppc/patch?id=4423

honeydew:~ # crash -s /root/2.6.15.42-kexec/vmlinux /proc/vmcore
crash: pglist_data.node_mem_map structure member does not exist.
crash: certain memory-related commands will fail or display invalid data

crash: invalid kernel virtual address: aeeeeeeeef3736ae  type: "runqueues entry (per_cpu)"