[GHC] #15826: Allow registering (Source)Plugins through the GHC API

[GHC]

#15826: Allow registering (Source)Plugins through the GHC API
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        Reporter:  DanielG           |                Owner:  DanielG
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  GHC API           |              Version:  8.7
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5278
       Wiki Page:                    |
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Comment (by DanielG):

 Yeah I just had another look and I think I forgot to hook up some of the
 recompilation logic, I'll fix it and add some tests.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15826#comment:11>
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