Fix the number of lwlocks needed by the "fast path" lock patch. It needs
one lock per backend or auxiliary process - the need for a lock for each aux processes was not accounted for in NumLWLocks(). No-one noticed, because the three locks needed for the three aux processes fit into the few extra lwlocks we allocate for 3rd party modules that don't call RequestAddinLWLocks() (NUM_USER_DEFINED_LWLOCKS, 4 by default).
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