[GHC] Batch modify: #7828, #7845, #8671, #9883, #10381, #11216

Batch modification to #7828, #7845, #8671, #9883, #10381, #11216 by thomie: keywords to RebindableSyntax -- Tickets URL: http://ghc.haskell.org/trac/ghc/query?id=7828%2C7845%2C8671%2C9883%2C10381%2... GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler