[GHC] #8398: reify module list in TH

[GHC]

#8398: reify module list in TH
-------------------------------------------+-------------------------------
       Reporter:  errge                    |             Owner:
           Type:  bug                      |            Status:  new
       Priority:  normal                   |         Milestone:  7.8.1
      Component:  Compiler                 |           Version:  7.6.3
       Keywords:                           |  Operating System:
   Architecture:  Unknown/Multiple         |  Unknown/Multiple
     Difficulty:  Easy (less than 1 hour)  |   Type of failure:
     Blocked By:                           |  None/Unknown
Related Tickets:  #8337                    |         Test Case:
                                           |          Blocking:  7867
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 This patch is for the use-case detailed in #7867.

 The added Q monad method provides the ability to get a list of module
 names in a format that is compatible with the module annotation
 reification in #8337.

 The patch contains a helper method that depends on #8337, so that should
 be applied first.  If this is problematic, it's easy to separate this
 patch into one that doesn't depend on #8337 and an other that does.  Then
 we can add the latter later.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8398>
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