[GHC] #14750: Plugins should be loaded once for each module rather than multiple times

[GHC]

#14750: Plugins should be loaded once for each module rather than multiple times
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           Reporter:  mpickering     |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.2
           Keywords:  plugins        |  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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 Plugins are currently loaded immediately before they are used in the
 simplifier and constraint solver. It would be better to load them once, at
 the start of the pipeline rather than at each of these different places.

 lazer already has a patch which achieves this. I'm making it a separate
 ticket as it need not be blocked on the progress of #14709

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14750>
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