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This implements the `StrictData` language extension, which lets the programmer default to strict data fields in datatype declarations on a per-module basis. Specification and motivation can be found at https://ghc.haskell.org/trac/ghc/wiki/StrictPragma This includes a tricky parser change due to conflicts regarding `~` in the type level syntax: all ~'s are parsed as strictness annotations (see `strict_mark` in Parser.y) and then turned into equality constraints at the appropriate places using `RdrHsSyn.splitTilde`. Updates haddock submodule. Test Plan: Validate through Harbormaster. Reviewers: goldfire, austin, hvr, simonpj, tibbe, bgamari Reviewed By: simonpj, tibbe, bgamari Subscribers: lelf, simonpj, alanz, goldfire, thomie, bgamari, mpickering Differential Revision: https://phabricator.haskell.org/D1033 GHC Trac Issues: #8347
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