mm: exit.c reorder wait_opts to remove padding on 64 bit builds

Reorder struct wait_opts to remove 8 bytes of alignment padding on 64 bit
builds.
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/exit.c

@@ -1082,8 +1082,8 @@ SYSCALL_DEFINE1(exit_group, int, error_code)
 
 struct wait_opts {
 	enum pid_type		wo_type;
-	struct pid		*wo_pid;
 	int			wo_flags;
+	struct pid		*wo_pid;
 
 	struct siginfo __user	*wo_info;
 	int __user		*wo_stat;