Avoid redundant checks for finals bits

Avoid redundant checks for finals bits

In changeset b28fd72842fc9ce935bed74f7b2ba79f9cc59711 (Run the mark phase
in a fork()ed process) we inadvertently changed the lazy allocation of
finals bit set to eager allocation.

This change left a lot of finals bit set initialization checks that are
not really needed using eager allocation.

We remove this redundant check as we decided to go with the eager
allocation to trade some space for a little more speed, as the extra
checks takes time and is very rare that a whole pool doesn't have any
blocks that need finalization, making the space saving very rare too.

Lazy allocation can impact too in locality of reference, as is more likely
that all the bit sets are allocated near in space, except for the lazyly
allocated one.