API Annotations D538 call for review

[Alan & Kim Zimmerman]

Hi All

https://phabricator.haskell.org/D538 is now ready for review/merge.

It contains a number of small changes based on actually using the API
annotations in ghc-exactprint [1] which is now able to perfectly reproduce
the original source using only the ParsedSource AST and API annotations.

[1] https://github.com/alanz/ghc-exactprint/tree/wip

Regards
  Alan
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