[GHC] #11149: Unify fixity/associativity of <>-ish pretty-printing operators

[GHC]

#11149: Unify fixity/associativity of <>-ish pretty-printing operators
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           Reporter:  hvr            |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          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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 Throughout GHC's source there are related pretty-printing operators with
 subtly different `infixr/infixl`-declarations.

 It would be desirable to unify those and possibly use `Semigroup((<>))`
 instead (where `<>` represents a semigroup/monoid operation anyway)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11149>
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