[GHC] #5984: TH: newtypes are converted to datas

[GHC]

#5984: TH: newtypes are converted to datas
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 Reporter:  mikhail.vorozhtsov  |          Owner:                  
     Type:  bug                 |         Status:  new             
 Priority:  normal              |      Component:  Compiler        
  Version:  7.5                 |       Keywords:                  
       Os:  Unknown/Multiple    |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown        |       Testcase:                  
Blockedby:                      |       Blocking:                  
  Related:                      |  
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 Commit b857c8ad367877f424b5fca50bd45199f39f86c7 has a typo in `cvtDec`
 that causes a `NewtypeD` to be translated to `TyData` with
 `tc_ND=DataType` instead of `NewType`. Trivial fix attached.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5984>
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