locking, task_struct: Reduce size on TRACE_IRQFLAGS and 64bit

Reorder task_struct field for TRACE_IRQFLAGS to remove padding
on 64-bit.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4B135F50.8070302@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/sched.h

@@ -1421,17 +1421,17 @@ struct task_struct {
 #endif
 #ifdef CONFIG_TRACE_IRQFLAGS
 	unsigned int irq_events;
-	int hardirqs_enabled;
 	unsigned long hardirq_enable_ip;
-	unsigned int hardirq_enable_event;
 	unsigned long hardirq_disable_ip;
+	unsigned int hardirq_enable_event;
 	unsigned int hardirq_disable_event;
-	int softirqs_enabled;
+	int hardirqs_enabled;
+	int hardirq_context;
 	unsigned long softirq_disable_ip;
-	unsigned int softirq_disable_event;
 	unsigned long softirq_enable_ip;
+	unsigned int softirq_disable_event;
 	unsigned int softirq_enable_event;
-	int hardirq_context;
+	int softirqs_enabled;
 	int softirq_context;
 #endif
 #ifdef CONFIG_LOCKDEP