[GHC] #4012: Compilation results are not deterministic

[GHC]

#4012: Compilation results are not deterministic
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        Reporter:  kili           |            Owner:
            Type:  bug            |           Status:  new
        Priority:  high           |        Milestone:  7.6.2
       Component:  Compiler       |          Version:  6.12.2
      Resolution:                 |         Keywords:
Operating System:                 |     Architecture:  Unknown/Multiple
  Unknown/Multiple                |       Difficulty:  Difficult (2-5 days)
 Type of failure:  Other          |       Blocked By:
       Test Case:                 |  Related Tickets:
        Blocking:                 |
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Comment (by nh2):

 Is this related to https://ghc.haskell.org/trac/ghc/ticket/8144, and does
 its fix maybe improve the situation?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:39>
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