ANDROID: mm: slab: Fix 'merge changes moved struct track' issue

Local commit 1fb8e678a5 ("ANDROID: mm: add get_each_object_track
function") moves 'struct track' from mm/slub.c to mm/slab.h to make it
public.  Then upstream commit 788691464c ("mm/slub: use stackdepot
to save stack trace in objects") adapts the struct from its old
location.  For whatever reason this goes unnoticed by Git during the
merge process and the change is lost into the ether.  This patch
replicates the change in the new location.

Bug: 193130194
Fixes: 1fb8e678a5 ("ANDROID: mm: add get_each_object_track function")
Fixes: 788691464c ("mm/slub: use stackdepot to save stack trace in objects")
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Change-Id: Ie9a3c3f6ccbf6434f06ffc4e1598f2d096a1fa94

mm/slab.h

@@ -98,8 +98,8 @@ gfp_t kmalloc_fix_flags(gfp_t flags);
 #define TRACK_ADDRS_COUNT 16
 struct track {
 	unsigned long addr;	/* Called from address */
-#ifdef CONFIG_STACKTRACE
-	unsigned long addrs[TRACK_ADDRS_COUNT];	/* Called from address */
+#ifdef CONFIG_STACKDEPOT
+	depot_stack_handle_t handle;
 #endif
 	int cpu;		/* Was running on cpu */
 	int pid;		/* Pid context */