[GHC] #11011: Add type-indexed type representations (`TypeRep a`)

[GHC]

#11011: Add type-indexed type representations (`TypeRep a`)
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        Reporter:  bjmprice          |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              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):
       Wiki Page:                    |
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Comment (by simonpj):

 Oh yes, we have section about that: 5.8 in the paper.

 OK then, how do we implement `spitPolyTyConApp`. The old API looked like:
 {{{
 splitPolyTyConApp :: TypeRep -> (TyCon,[KindRep],[TypeRep])

 }}}
 but what should the API look like now?  Presumably the type args should be
 done with the new type-app-decomposition stuff, and when that says "not a
 type application" we can ask for the `TyCon` and `KindRep` args?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11011#comment:17>
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