[GHC] #8413: testsuite: Allow to skip performance tests

[GHC]

#8413: testsuite: Allow to skip performance tests
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        Reporter:  nomeata           |            Owner:  nomeata
            Type:  feature request   |           Status:  patch
        Priority:  normal            |        Milestone:
       Component:  Test Suite        |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by nomeata):

 * status:  new => patch


Comment:

 Patch for review in branch `wip/T8413`; I?d like to hear a second ?ok?
 instead before pushing the changes.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8413#comment:1>
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