[GHC] #8320: Build fails due to Haddock error in ghc-prim:GHC.Types

[GHC]

#8320: Build fails due to Haddock error in ghc-prim:GHC.Types
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        Reporter:  guest                |            Owner:
            Type:  bug                  |           Status:  new
        Priority:  highest              |        Milestone:  7.8.1
       Component:  Build System         |          Version:  7.7
      Resolution:                       |         Keywords:
Operating System:  Linux                |     Architecture:  x86
 Type of failure:  Building GHC failed  |       Difficulty:  Unknown
       Test Case:                       |       Blocked By:
        Blocking:                       |  Related Tickets:
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Comment (by kazu-yamamoto):

 Even after #8276 is fixed, this problem still exists. I met this problem
 on 32bit Linux and FreeBSD today.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8320#comment:26>
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