tools/vm/slabinfo: add partial slab listing to -X

We would like to see how fragmented the SLUB allocator is, one window into
fragmentation is the total number of partial slabs.

Currently `slabinfo -X` shows slabs sorted by loss and by size.  We can
use this option to also show slabs sorted by number of partial slabs.

Option '-X' can be used in conjunction with '-N' to control the number of
slabs shown e.g.  list of top 5 slabs:

	slabinfo -X -N5

Add list of slabs ordered by number of partial slabs to output of
`slabinfo -X`.

Link: http://lkml.kernel.org/r/20190426022622.4089-3-tobin@kernel.org
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Cc: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>,
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pekka Enberg <penberg@iki.fi>
Cc: Qian Cai <cai@lca.pw>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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