Proposal: Add `instance Bits Bool`

[Herbert Valerio Riedel]

On 2013-11-10 at 23:33:31 +0100, Edward Kmett wrote:
> We went through all the pain of removing Num as a superclass of Bits to
> support it, but we apparently never actually put the instance of Bits (and
> FiniteBits) for Bool into base.

> I propose we do so.

+1