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

[GHC]

#10854: Remove recursive uses of `pprParendHsExpr` from `HsExpr.ppr_expr`
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        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:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * cc: alanz (added)


Comment:

 Adding alanz who has done some work in this area.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10854#comment:2>
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