[GHC] #8173: GHC uses nub

[GHC]

#8173: GHC uses nub
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        Reporter:  nh2               |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  Compile-time      |       Difficulty:  Moderate (less
  performance bug                    |  than a day)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 By all means add `nubOrd` to `compiler/utils` and change calls to `nub` in
 GHC.  Could you check what effect doing so has on the performance of the
 compiler?  thanks!

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8173#comment:4>
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