sl[au]b: always get the cache from its page in kmem_cache_free

struct page already have this information. If we start chaining
caches, this information will always be more trustworthy than
whatever is passed into the function

With this patch, we are also modifying __kmem_cache_create's signature,
so the slub doesn't need to derive the page pointer again (even though
it should be cache-hot...)

[ v3: added parent testing with VM_BUG_ON ]
[ v4: make it faster when kmemcg not in use ]
[ v6: move it to slab_common.c ]

Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: Christoph Lameter <cl@linux.com>
CC: Pekka Enberg <penberg@cs.helsinki.fi>
CC: Christoph Lameter <cl@linux.com>
CC: Pekka Enberg <penberg@cs.helsinki.fi>
CC: Michal Hocko <mhocko@suse.cz>
CC: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: Johannes Weiner <hannes@cmpxchg.org>
CC: Suleiman Souhlal <suleiman@google.com>
CC: Tejun Heo <tj@kernel.org>