slub: remove verify_mem_not_deleted()

I do not see any user for this code in the tree.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

diff --cc include/linux/slub_def.h
Simple merge

diff --cc mm/slub.c
Simple merge