proposal/RFC: add bSwap to base in Data.Bits

[Vincent Hanquez]

Hi,

I'm trying to expose some byte swapping (bSwap) capabilities in base, namely
operation to allow to swap endianness on word{16,32,64}, i.e.:

  bswap16 :: Word16 -> Word16
  bswap16 a = (a `shiftR` 8) .|. (a `shiftL` 8)
  ...

I'ld want to propose to extends Bits to do so generically:

  class Bits a where
    ...  
    bSwap : a -> a

I'm attaching a patch that do as explained, and add a default implementation
for bSwap, so that compatibility is assured for existing instances.

-- 
Vincent
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