perf: Fix perf_event_do_pending() fallback callsite

Paul questioned the context in which we should call
perf_event_do_pending(). After looking at that I found that it should be
called from IRQ context these days, however the fallback call-site is
placed in softirq context. Ammend this by placing the callback in the IRQ
timer path.

Reported-by: Paul Mackerras <[e-mail]>
Signed-off-by: Peter Zijlstra <[e-mail]>
LKML-Reference: <1263374859.4244.192.camel@laptop>
Signed-off-by: Ingo Molnar <[e-mail]>

kernel/timer.c

···
 	run_local_timers();
 	rcu_check_callbacks(cpu, user_tick);
 	printk_tick();
+	perf_event_do_pending();
 	scheduler_tick();
 	run_posix_cpu_timers(p);
 }
···
 static void run_timer_softirq(struct softirq_action *h)
 {
 	struct tvec_base *base = __get_cpu_var(tvec_bases);
-
-	perf_event_do_pending();
 
 	hrtimer_run_pending();