[GHC] #7860: Add more bit fiddling functions to 'integer-gmp'

[GHC]

#7860: Add more bit fiddling functions to 'integer-gmp'
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    Reporter:  lebedev            |       Owner:                  
        Type:  feature request    |      Status:  new             
    Priority:  normal             |   Milestone:                  
   Component:  libraries (other)  |     Version:  7.6.3           
    Keywords:  gmp                |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple   |     Failure:  None/Unknown    
  Difficulty:  Unknown            |    Testcase:                  
   Blockedby:                     |    Blocking:                  
     Related:  #3489              |  
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Comment(by lebedev):

 I'm almost done with the patch, do I need to write some test cases as
 well?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7860#comment:3>
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