[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:  8.2.1
       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 ekmett):

 We've spoken about moving `reflection` into GHC itself, because the core
 of it is well typed, even if it can't be properly expressed in the surface
 language, and we had planned to put it in `GHC.Reflection`. (Back at ICFP
 in Boston a couple of years ago.)

 The main reason why it didn't happen at the time was that by the time
 Austin and I got done writing `Proxy#` the conference was over.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11011#comment:36>
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