[GHC] Batch modify: #11282, #11247, #9173, #8159, #4288, #4017

Batch modification to #11282, #11247, #9173, #8159, #4288, #4017 by thomie: failure to Incorrect warning at compile-time -- Tickets URL: http://ghc.haskell.org/trac/ghc/query?id=11282%2C11247%2C9173%2C8159%2C4288%... GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler