[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 goldfire):

 I think we can have our cake and eat it too. Just use a new module name
 and then we can have `Data.Typeable.TypeRep` be different from
 `Data.Reflection.TypeRep`. (Of course, we can keep just one `Typeable`,
 happily.)

 I vastly prefer `TypeRep` and `TypeRepX` over `TTypeRep` and `TypeRep`.
 But I have no great reason for doing so.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11011#comment:24>
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