[PATCH] m32r: build fix

This patch is required to fix compile errors for m32r.

This was originally given by the following patch:
  [PATCH] move irq_enter and irq_exit to common code
  http://www.ussg.iu.edu/hypermail/linux/kernel/0411.1/1738.html

I think it was maybe accidentally dropped only for the m32r arch due to a
patching conflict with the other patches or something like that.
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-m32r/hardirq.h

@@ -27,18 +27,6 @@ typedef struct {
 # error HARDIRQ_BITS is too low!
 #endif
 
-#define irq_enter()		(preempt_count() += HARDIRQ_OFFSET)
-#define nmi_enter()		(irq_enter())
-#define nmi_exit()		(preempt_count() -= HARDIRQ_OFFSET)
-
-#define irq_exit()							\
-do {									\
-		preempt_count() -= IRQ_EXIT_OFFSET;			\
-		if (!in_interrupt() && softirq_pending(smp_processor_id())) \
-			do_softirq();					\
-		preempt_enable_no_resched();				\
-} while (0)
-
 static inline void ack_bad_irq(int irq)
 {
 	printk(KERN_CRIT "unexpected IRQ trap at vector %02x\n", irq);