rcutorture: Disable fragile readers during overload testing

Vanilla RCU readers, when either non-preemptible or preemptible with
priority-boosting enabled, can handle heavy overload conditions.
Other RCU implementations are more fragile.  This commit adds an
rcu_torture_ops structure field named ->rdrs_handle_load that is set
for non-fragile configurations of vanilla RCU, but cleared otherwise.
It also refrains from running fragile readers concurrently with overload
testing, thus avoiding false-positive overload-testing failures.

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

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