Add bindings for marshaling to/from mpz_t

Please add bindings to allow efficient marshaling between Haskell Integer and C mpz_t's, e.g.:

  -- Wraps a (struct __mpz_struct*).
  type Mpz = Ptr ()

  toMpz :: Integer -> IO Mpz
  fromMpz :: Mpz -> IO Integer

This would be useful for efficiently interfacing with foreign code that uses GMP.

Trac metadata

Trac field	Value
Version	7.8.3
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries (other)
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