kernel - Add options SLAB_DEBUG to help debug memory corruption

kernel - Add options SLAB_DEBUG to help debug memory corruption

* Adding options SLAB_DEBUG to your kernel config will reconfigure
  kmalloc(), krealloc(), and kstrdup() to record all allocation
  sources on a zone-by-zone basis, file and line number.

  A full kernel recompile is needed when you add or drop this option
  from your kernel config.

* Limited to 32 slots per slab.  Since slabs offer a narrow range of
  chunk sizes this will normally be sufficient.

* When a memory corruption related panic occurs kgdb can be used
  to determine who allocated out of the slab in question.