[GHC] #16369: Implement testing of stage1 in ./validate --hadrian

[GHC]

#16369: Implement testing of stage1 in ./validate --hadrian
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           Reporter:  alpmestan      |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  high           |         Milestone:
          Component:  Build System   |           Version:  8.7
  (Hadrian)                          |
           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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 While `master` doesn't support `./validate --hadrian` yet, most of that
 patch is ready in [https://gitlab.haskell.org/ghc/ghc/merge_requests/326
 !326] and will be split up in a few MRs to make review & landing easier.
 However, it doesn't yet implement testing of the stage 1 compiler, just
 stage 2. This ticket serves as a reminder to implement testing of stage 1
 with hadrian in the validate script.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16369>
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