[GHC] Batch modify: #14123, #14251, #14873, #14899, #15519, #15768, ...

Batch modification to #14123, #14251, #14873, #14899, #15519, #15768, #4012, #7411, #8228, #9370, #10946, #12178, #13233, #13426, #13576, #13624, #13763, #14013, #14226, #14270, #14980, #15267, #15418, #15455, #15488 by osa1: milestone to 8.10.1 Comment: Bumping milestones of some high and highest priority tickets. -- Tickets URL: http://ghc.haskell.org/trac/ghc/query?id=14123%2C14251%2C14873%2C14899%2C155... GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler