Implemented support for this Linux 3.18 commit for kernels that are
configured with CONFIG_SLAB:

  commit bf0dea23a9c094ae869a88bb694fbe966671bf6d
  mm/slab: use percpu allocator for cpu cache

The commit above redesigned the kmem_cache.array_cache[] from a
hardwired array to a per-cpu pointer referencing external array_cache
structures.  Without the patch, the crash session would fail during
initialization with the message "crash: cannot resolve cache_cache".
Note that it could be worked around by using the "--no_kmem_cache"
command line option, with a resulting loss of functionality for
commands requiring slab-related data.
(anderson@redhat.com)