HIE Files

Hello, I will be working on a GSOC project that will allow GHC to output a new .hie file to be written next to .hi files. It will contain information about the typechecked Haskell AST, allowing tooling(like haddocks --hyperlinked-source and haskell-ide-engine) to work without having to parse, rename and typecheck files all over again. I have made a GHC wiki page containing more details here: https://ghc.haskell.org/trac/ghc/wiki/HIEFiles Looking forward to any comments and suggestions. Thanks, Zubin.