Rufflewind authored Jan 10, 2017 and Ben Gamari committed Jan 10, 2017

- Fix #13076 by wrapping `printDoc_` so that the terminal color is
  reset even if an exception occurs.

- Add `printSDoc`, `printSDocLn`, and `bufLeftRenderSDoc` to keep `SDoc`
  values abstract (they are wrappers of `printDoc_`, `printDoc`, and
  `bufLeftRender` respectively).

- Remove unused function: `printForAsm`

Test Plan: manual

Reviewers: RyanGlScott, austin, dfeuer, bgamari

Reviewed By: dfeuer, bgamari

Subscribers: dfeuer, mpickering, thomie

Differential Revision: https://phabricator.haskell.org/D2932

GHC Trac Issues: #13076