Fix prelude definitions of abs/signum for Floats/Doubles

[Levent Erkok]

On Thu, Apr 11, 2013 at 2:58 AM, Shachaf Ben-Kiki <shachaf at gmail.com> wrote:

>
>
> Maybe it would be simpler to say:
>
> signum x | x == 0    = x
>          | isNaN x   = x
>          | x > 0     = 1
>          | otherwise = negate 1
>
>     Shachaf
>

Thanks Shachaf. This version is equivalent to the one I proposed, and it
saves one test; so it's definitely preferable. I'll put this one in the
ticket that'll finally be created for GHC.

-Levent.
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