[GHC] #13252: Perf: Make dep_finsts a map from type family Name to Module

[GHC]

#13252: Perf: Make dep_finsts a map from type family Name to Module
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        Reporter:  ezyang            |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      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 bgamari):

 N.B. the above was intended for #13525.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13252#comment:2>
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