[GHC] #10886: Remove the magic from `Any`

[GHC]

#10886: Remove the magic from `Any`
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        Reporter:  goldfire          |                Owner:  goldfire
            Type:  task              |               Status:  closed
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2049
       Wiki Page:                    |
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Comment (by thomie):

 This should probably be mentioned in release notes and migration guide.
 This breaks for example the `constraints` package (it uses `Any` from
 `Prim`).

 These kind of little breakages are annoying, and seem so unnecessary. Can
 we do something about it? A suggestion:
 * Rename `GHC.Prim` to something else, and make `GHC.Prim` a backward
 compatible module that exports `GHC.Exts` (including `Any` and
 `Constraints` for example).

 This seems less work than replacing `GHC.Prim` to `GHC.Exts` across
 hackage.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10886#comment:8>
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