[GHC] #13737: Have typechecking produce HsType Typechecked instead of Type

[GHC]

#13737: Have typechecking produce HsType Typechecked instead of Type
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        Reporter:  goldfire          |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by alexbiehl):

 Doing this would also benefit haddock as it currenly converts Type to
 HsType manually. This caused quite a few bugs in the past (the infamous
 "UnhelpfulSpan" error for example).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13737#comment:2>
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