mm: move slabinfo.c to tools/vm

We have tools/vm/ folder for vm tools, so move slabinfo.c from tools/slub/
to tools/vm/

Signed-off-by: Dave Young <[e-mail]>
Cc: Wu Fengguang <[e-mail]>
Acked-by: Christoph Lameter <[e-mail]>
Cc: Pekka Enberg <[e-mail]>
Cc: Frederic Weisbecker <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

tools/vm/Makefile

···
 CC = $(CROSS_COMPILE)gcc
 CFLAGS = -Wall -Wextra
 
-all: page-types
+all: page-types slabinfo
 %: %.c
 	$(CC) $(CFLAGS) -o $@ $^
 
 clean:
-	$(RM) page-types
+	$(RM) page-types slabinfo