[GHC] #12970: Add default implementation for Bits.bitSize

[GHC]

#12970: Add default implementation for Bits.bitSize
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        Reporter:  txnull            |                Owner:  dfeuer
            Type:  feature request   |               Status:  patch
        Priority:  high              |            Milestone:  8.6.1
       Component:  libraries/base    |              Version:
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3723,
       Wiki Page:                    |  Phab:D4857
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * differential:  Phab:D3723 => Phab:D3723, Phab:D4857


Comment:

 Adding default implementation for 8.6 in D4857.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12970#comment:21>
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