[GHC] #10854: Remove recursive uses of `pprParendHsExpr` from `HsExpr.ppr_expr`

[GHC]

#10854: Remove recursive uses of `pprParendHsExpr` from `HsExpr.ppr_expr`
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:  kseo
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13238            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by RyanGlScott):

 Strictly speaking, I don't think this ticket's goal has been achieved yet,
 since it's possible to find recursive occurrences of `pprDebugParendExpr`
 (i.e.,
 [http://git.haskell.org/ghc.git/blob/eb46345d37ee61575e6fed04da718c1b7ee0bb99:/compiler/hsSyn/HsExpr.hs#l982
 here]), which is just a thin wrapper around `pprParendExpr`. But then
 again, I am not the person who originally opened this ticket, so all I can
 offer is speculation.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10854#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler