Merge branch 'slab/for-6.9/slab-flag-cleanups' into slab/for-linus

Merge a series from myself that replaces hardcoded SLAB_ cache flag
values with an enum, and explicitly deprecates the SLAB_MEM_SPREAD flag
that is a no-op sine SLAB removal.

diff --cc mm/slab.h
Simple merge

diff --cc mm/slab_common.c
Simple merge

diff --cc mm/slub.c
Simple merge