[GHC] #8050: add a required wrapper around plugin installers

[GHC]

#8050: add a required wrapper around plugin installers
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        Reporter:  nfrisby           |            Owner:
            Type:  task              |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 Why can't the call to `mkPluginInstaller` be done by GHC itself, on line
 314 of `SimplCore`?  Why make the users call it?

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8050#comment:1>
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