[GHC] #11660: Remove Type pretty-printer in favor of IfaceType

[GHC]

#11660: Remove Type pretty-printer in favor of IfaceType
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        Reporter:  bgamari           |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      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 bgamari):

 I quickly looked at this; unfortunately more `SOURCE` imports of `TyCoRep`
 is almost inevitable under this change. Currently `IfaceType` must import
 `TyCoRep` due to the conversion functions. Now we'll also need the inverse
 import in order to implement the `Type` pretty-printer in terms of the
 `IfaceType` printer.

 I suppose we could move the `IfaceType` conversion functions to `Type`,
 although this seems like it would be an odd break with how the other iface
 constructs are handled.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11660#comment:3>
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