[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 RyanGlScott):

 I've confirmed that the commit that fixed this was
 ac1ade1ad25f145ab27219c4fb8366e982658873 (`Fix seq# case of
 exprOkForSpeculation`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15114#comment:5>
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