[GHC] #14890: Make Linux slow validate green

[GHC]

#14890: Make Linux slow validate green
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  alpmestan
            Type:  task              |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  D4546, D4636,
       Wiki Page:                    |  D4712
-------------------------------------+-------------------------------------

Comment (by alpmestan):

 Ben, I suppose we can now give a shot at enabling the slow validate
 scenario in our Circle CI config? We want to run it on a nightly basis
 right? Or per-commit?

 For reference, [https://circleci.com/gh/ghc/ghc/4420 a full slow validate]
 appears to take a little over 2 hours. We have to weight that against the
 usefulness of having per-commit (or per-merged-patch, I suppose) slow
 validate status. If I remember correctly, we were leaning towards nightly.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14890#comment:9>
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