rcutorture: Use this_cpu_inc() for rcu_torture_count[] and rcu_torture_batch[]

Currently __this_cpu_inc() is used to increment elements of both
the rcu_torture_count[] and rcu_torture_batch[] arrays.  However,
this can fail when the increments can happen in interrupt handlers,
as recently became possible.  This commit therefore upgrades the uses
of __this_cpu_inc() to the interrupt-safe this_cpu_inc().

KCSAN located this issue.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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