[GHC] #15114: ghc 8.4.1 optimizes True to False

[GHC]

#15114: ghc 8.4.1 optimizes True to False
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        Reporter:  elaforge          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.1
      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 diatchki):

 As another data point, I can reproduce this with 8.4.1 on Linux too with
 `-O`.  However, it goes away if I compile with `-O2`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15114#comment:2>
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