[GHC] #12707: Add contributed performance testcase

[GHC]

#12707: Add contributed performance testcase
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Test Suite        |              Version:  8.0.1
      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 Ben Gamari <ben@…>):

 In [changeset:"e8d74321b5b24afcb4230510fd6e4c4ecf6f3e19/ghc"
 e8d74321/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e8d74321b5b24afcb4230510fd6e4c4ecf6f3e19"
 testsuite: Add performance testcase from #12707
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12707#comment:2>
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