[PATCH tip/core/rcu 0/2] rcu: lastcomp cleanups, fix rcu_pending()false positives

[Paul E. McKenney]

These two patches are yet more from the ongoing cleanup/inspection
session for RCU.

1.	Get the (hopefully) last of the accesses to the ->completed
	fields cleaned up.

2.	Fix a race in __rcu_pending() accesses to ->gpnum and
	->completed fields that could cause needless (but otherwise
	harmless) raising of RCU_SOFTIRQ.
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