[GHC] #14890: Make Linux slow validate green

[GHC]

#14890: Make Linux slow validate green
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  alpmestan
            Type:  task              |               Status:  new
        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
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"ca3d3039386b145ae2835ca563b4c5a3497c25c9/ghc"
 ca3d3039/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ca3d3039386b145ae2835ca563b4c5a3497c25c9"
 Fix another batch of `./validate --slow` failures

 A rather detailed summary can be found at:

     https://gist.github.com/alpmestan/be82b47bb88b7dc9ff84105af9b1bb82

 This doesn't fix all expectation mismatches yet, but we're down to about
 20 mismatches with my previous patch and this one, as opposed to ~150
 when I got started.

 Test Plan: ./validate --slow

 Reviewers: bgamari, erikd, simonmar

 Reviewed By: simonmar

 Subscribers: thomie, carter

 GHC Trac Issues: #14890

 Differential Revision: https://phabricator.haskell.org/D4636
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14890#comment:6>
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