[GHC] #5941: Add compilation stage plugins

[GHC]

#5941: Add compilation stage plugins
-------------------------------------+-------------------------------------
              Reporter:  tibbe       |            Owner:
                  Type:  feature     |           Status:  infoneeded
  request                            |        Milestone:  7.10.1
              Priority:  normal      |          Version:  7.4.1
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by thomie):

 * status:  new => infoneeded


Comment:

 Is this feature request covered by [wiki:Plugins/TypeChecker], Phab:D489?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5941#comment:3>
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