mm: slub: panic for object and slab errors

If the SLUB_DEBUG_PANIC_ON Kconfig option is
selected, also panic for object and slab
errors to allow capturing relevant debug
data.

Change-Id: Idc582ef48d3c0d866fa89cf8660ff0a5402f7e15
Signed-off-by: David Keitel <dkeitel@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>