[GHC] #13238: Harmonise pretty printing of parens in hsSyn

[GHC]

#13238: Harmonise pretty printing of parens in hsSyn
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           Reporter:  alanz          |             Owner:  alanz
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Phab:D3043 Removes the insertion of parens in the pretty printer for
 `HsPar`.  This is motivated by making it easier to see if there is a
 problem with the `ppr` round trip capability introduced in #3384.

 Due to a lack of time, the has not been done for `ParPat` or `HsParTy`.

 Complete this work.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13238>
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