[GHC] #15633: Type-checker plugins aren't loaded in GHCi 8.6.1

[GHC]

#15633: Type-checker plugins aren't loaded in GHCi 8.6.1
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        Reporter:  phadej            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.6.1-beta1
      Resolution:                    |             Keywords:
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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Comment (by darchon):

 Possibly, the GHCi session is missing a call to `initializePlugins`
 https://github.com/ghc/ghc/blob/52065e95c6df89d0048c6e3f35d6cc26ce8246f9/compiler/main/DynamicLoading.hs#L78?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15633#comment:3>
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