rcu: Make rcupreempt_trace.c look at offline CPUs

Given that offline CPUs can now have non-zero counters, we need
to dump counters for offline CPUs as well as for online CPUs.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: josht@linux.vnet.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: hugh.dickins@tiscali.co.uk
Cc: benh@kernel.crashing.org
LKML-Reference: <12503552313921-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>