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Adds two tests (one for Trac #4340 and one for Trac #10272), as well as advice on how to fix your code if `hsc2hs` emits warnings with GHC 8.0 due to a redefinition of `#alignment`. (I also put the advice in the [GHC 8.0 Migration Guide](https://ghc.haskell.org/trac/ghc/wiki/Migration/8.0).) Reviewed By: thomie Differential Revision: https://phabricator.haskell.org/D1663 GHC Trac Issues: #4340, #10272
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