[GHC] Batch modify: #12776, #12944, #12425, #11525, #11731, #12234, ...

Batch modification to #12776, #12944, #12425, #11525, #11731, #12234, #12846, #12885, #12921, #12985, #13025, #13035, #13043, #13050, #13056, #13083, #13135, #13285, #12055 by bgamari: Action: merged -- Tickets URL: http://ghc.haskell.org/trac/ghc/query?id=12776%2C12944%2C12425%2C11525%2C117... GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler