perf kmem stat: Track memory freed

Track freed memory as well as allocations and show the net in the
summary.

Committer notes:

Testing it:

  # perf kmem record usleep 1
  [ perf record: Woken up 0 times to write data ]
  [ perf record: Captured and wrote 1.626 MB perf.data (4208 samples) ]
  [root@jouet ~]# perf kmem stat --slab

  SUMMARY (SLAB allocator)
  ========================
  Total bytes requested: 234,011
  Total bytes allocated: 234,504
  Total bytes freed:     213,328                                 <------
  Net total bytes allocated: 21,176
  Total bytes wasted on internal fragmentation: 493
  Internal fragmentation: 0.210231%
  Cross CPU allocations: 4/1,963
  #

Signed-off-by: David Ahern <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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