[GHC] #14989: "Each block should be reachable from only one ProcPoint" compiling `integer` with `-fllvm`

[GHC]

#14989: "Each block should be reachable from only one ProcPoint" compiling
`integer` with `-fllvm`
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        Reporter:  sgraf             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by sgraf):

 * Attachment "Main.2.hs" added.

 Reproduction with only 2 branches instead of 3

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14989>
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