Revert "dumpstate: Temporarily disable dumping /proc/slabinfo to avoid kernel crash."

This reverts commit 666c11d13f.

cmds/dumpstate/dumpstate.c

@@ -49,11 +49,7 @@ static void dumpstate(int full) {
         PRINT("------ VIRTUAL MEMORY STATS ------");
         DUMP("/proc/vmstat");
         PRINT("------ SLAB INFO ------");
-#if 0
         DUMP("/proc/slabinfo");
-#else
-        PRINT("temporarily disabled to avoid kernel crasher");
-#endif
         PRINT("------ ZONEINFO ------");
         DUMP("/proc/zoneinfo");
         PRINT("------ SYSTEM LOG ------");