[GHC] #12935: Object code produced by GHC is non-deterministic

[GHC]

#12935: Object code produced by GHC is non-deterministic
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by niteria):

 @nh: What about collisions?
 Uniques are 64 bits on 64 bit systems. 8 bits are taken for the tag, that
 leaves us with 56 bits.
 You can expect collisions after `2^26` uniques are allocated. That's
 `67108864`. It's a pretty small number.
 We've definitely seen cases of running out of 24 bits for larger projects.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12935#comment:12>
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