[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:  hvr
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Core Libraries    |              Version:  7.6.3
      Resolution:                    |             Keywords:  integer-gmp
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #3489, #9835      |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by hvr):

 Just for the record, I did start a couple months ago
 (http://git.haskell.org/ghc.git/shortlog/refs/heads/wip/T7860) before I
 shifted attention to more urgent tasks

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7860#comment:20>
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