Fixed nanobenchmark `queueEstimator`.
Fixed nanobenchmark `queueEstimator`.

Declared `total` as static to prevent the compiler from optimizing away
the loop.

jblomer/ramcloud,jblomer/ramcloud,utah-scs/RAMCloud,anirajk/RAMCloud,utah-scs/RAMCloud,utah-scs/RAMCloud,jblomer/ramcloud,jblomer/ramcloud,jblomer/ramcloud,utah-scs/RAMCloud,utah-scs/RAMCloud,anirajk/RAMCloud,jblomer/ramcloud,anirajk/RAMCloud,utah-scs/RAMCloud,anirajk/RAMCloud,anirajk/RAMCloud,anirajk/RAMCloud