[GHC] #11019: ApiAnnotations: Make all RdrName occurences Located

[GHC]

#11019: ApiAnnotations: Make all RdrName occurences Located
-------------------------------------+-------------------------------------
           Reporter:  alanz          |             Owner:  alanz
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.10.2
           Keywords:                 |  Operating System:  Unknown/Multiple
  ApiAnnotations                     |
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 At the moment the API Annotations can only be used on the `ParsedSource`,
 as there are changes made to the `RenamedSource` that prevent it from
 being used to round trip source code.

 It is possible to build a map from every `Located Name` in the
 `RenamedSource` from its location to the `Name`, which can then be used
 when resolved names are required when changing the `ParsedSource`.

 However, there are instances where the identifier is not located,
 specifically

 {{{#!hs
   (GHC.VarPat name)
   (GHC.HsVar name)
   (GHC.UserTyVar name)
   (GHC.HsTyVar name)
 }}}

 Replace each of the `name` types above with `(Located name)`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11019>
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