[GHC] #12197: test suite: implement a way to run tests with stage1 compiler

[GHC]

#12197: test suite: implement a way to run tests with stage1 compiler
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           Reporter:  osa1           |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:
           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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 In Phab:D2334, #10382 and probably other tickets/patches, we want to run
 some tests on  compiler compiled with `GhcWithInterpreter=NO`. One way to
 do that is to run those tests with stage1 compiler, but current test
 runner doesn't give us a way to do that.

 We should add tests for Phab:D2334 (and probably for #10382) once this is
 implemented.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12197>
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