Default implementation of bitSize

[Andrew Martin]

The bitSize typeclass method has been deprecated since 4.7. However,
library author still have to implement it to avoid a warning. I propose
that a default implementation using bitSizeMaybe be added. It would look
like this:

    bitSize x = case bitSizeMaybe x of
      Nothing -> error "bitSize is deprecated and the type in question does
not have a finite bit size"
      Just a -> a

-- 
-Andrew Thaddeus Martin
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