[GHC] #7425: Add method to Data.Bits for creating zeroed values.

[GHC]

#7425: Add method to Data.Bits for creating zeroed values.
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Reporter:  Aninhumer         |          Owner:                  
    Type:  feature request   |         Status:  new             
Priority:  normal            |      Component:  libraries/base  
 Version:  7.6.1             |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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 The removal of the Num superclass from Data.Bits now means there is no
 simple way to create a value in which all bits are set to zero. There are
 obviously a variety of ways such a value can be constructed with the
 existing methods, but nonetheless it seems like an odd omission.

 The new method could be given an implementation in terms of the existing
 ones for backwards compatibility.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7425>
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