Data.HashTable.hashInt seems somewhat sub-optimal

[Donald Bruce Stewart]

Simon.Frankau:
> I tried submitting this bug through the tracker, but it seemed to give
> me permissions errors - probably a firewall issue here. :( Apologies.

Just a note that HashTable is pretty redundant in Haskell. For sizes you
can fit in memory, Map, IntMap or Data.Sequence perform at effectively
O(1) for reasonable purposes, and can hold larger numbers of elements
than Data.HashTable.

-- Don