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Simon Marlow authored
In the free list, we don't strictly speaking need to have every block in a coalesced group point to the head block, although this is an invariant for non-free blocks. Dropping this invariant for the free list means that coalesce() is O(1) rather than O(N), and freeGroup() is therefore O(N) not O(N^2). The bad case probably didn't happen most of the time, indeed it has never shown up in a profile that I've seen. I had a report from a while back that this was a problem with really large heaps, though. Fortunately the fix is easy.
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