Add `instance {Bits,FiniteBits} Bool`
Add `instance {Bits,FiniteBits} Bool`

This interprets `Bool` as an 1-bit "unsigned" bit-field and provides a
simple (not particularily optimized) implementation to that end.

See "Proposal: Add `instance Bits Bool`" by @ekmett, Nov 2013,

 http://permalink.gmane.org/gmane.comp.lang.haskell.libraries/20663

Signed-off-by: Herbert Valerio Riedel <202fbcf3c00694524024feb79f3bb8fc1c4e4f9c@gnu.org>

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