[GHC] Batch modify: #2595, #9701, #11310, #345, #1158, #7494, #7503, ...

Batch modification to #2595, #9701, #11310, #345, #1158, #7494, #7503, #8128, #8560, #8673, #9456, #9667, #9985, #10617, #11145 by thomie: keywords to GADTs -- Tickets URL: http://ghc.haskell.org/trac/ghc/query?id=2595%2C9701%2C11310%2C345%2C1158%2C... GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler