Paul E. McKenney 98834b8378 rcu: Exclude RCU-offline CPUs from expedited grace periods
The expedited RCU grace periods currently rely on a failure indication
from smp_call_function_single() to determine that a given CPU is offline.
This works after a fashion, but is more contorted and less precise than
relying on RCU's internal state.  This commit therefore takes a first
step towards relying on internal state.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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