[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:  7.12.1
       Component:  Compiler          |                 Version:  6.12.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Other             |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by puffnfresh):

 Correct, I tried reproducing with HEAD about 3 weeks ago, then again
 yesterday but it's always consistent. I can still reproduce with 7.10.1,
 so yeah, it's a little worrying and would be awesome if you could check.

 My results are published here:

 https://gist.github.com/puffnfresh/5a841633f0dde81fe7d1

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4012#comment:99>
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