[GHC] #11496: Build profiling libraries on `validate --slow`

[GHC]

#11496: Build profiling libraries on `validate --slow`
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           Reporter:  thomie         |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 It would be good to test the `profiling` test ways regularly (`prof`,
 `profasm`, `profthreaded` etc.). These test ways require the profiling
 libraries to be built first, which `validate` doesn't do at the moment. We
 do release profiling libraries, so we'd better make sure they work
 correctly.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11496>
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