[GHC] #14429: Remove constraint types from HsExtension, post TTG

[GHC]

#14429: Remove constraint types from HsExtension, post TTG
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        Reporter:  alanz             |                Owner:  alanz
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      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 alanz):

 This should also allow the type family declarations for the extension
 points to move back to their natural place in the hsSyn directory, with
 the data type they are extending.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14429#comment:2>
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