[GHC] #15137: Install primitive on CI before running tests

[GHC]

#15137: Install primitive on CI before running tests
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           Reporter:  osa1           |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.5
           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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 #15038 added a regression test that requires primitive package. Because
 the package is not installed by validate script it won't run on CI. We
 should probably update validate script to install it before running the
 test suite.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15137>
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