Merge branch 'slab/for-6.19/freelist_aba_t_cleanups' into slab/for-next

Merge branch 'slab/for-6.19/freelist_aba_t_cleanups' into slab/for-next

Merge series "slab: cmpxchg cleanups enabled by -fms-extensions"

From the cover letter [1]:

After learning about -fms-extensions being enabled for 6.19, I realized
there is some cleanup potential in slub code by extending the definition
and usage of freelist_aba_t, as it can now become an unnamed member of
struct slab. This series performs the cleanup, with no functional
changes intended. Additionally we turn freelist_aba_t to struct
freelist_counters as it doesn't meet any criteria for being a typedef,
per Documentation/process/coding-style.rst

Based on the tag kbuild-ms-extensions-6.19 from
git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linuxV

Link: https://lore.kernel.org/all/20251107-slab-fms-cleanup-v1-0-650b1491ac9e@suse.cz/#t