mm/slab: use stride to access slabobj_ext

mm/slab: use stride to access slabobj_ext

Use a configurable stride value when accessing slab object extension
metadata instead of assuming a fixed sizeof(struct slabobj_ext).

Store stride value in free bits of slab->counters field. This allows
for flexibility in cases where the extension is embedded within
slab objects.

Since these free bits exist only on 64-bit, any future optimizations
that need to change stride value cannot be enabled on 32-bit architectures.

Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Harry Yoo <harry.yoo@oracle.com>
Link: https://patch.msgid.link/20260113061845.159790-6-harry.yoo@oracle.com
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>