[GHC] #15382: heapprof001 segfaults in prof_hc_hb way on i386

[GHC]

#15382: heapprof001 segfaults in prof_hc_hb way on i386
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           Reporter:  bgamari   |             Owner:  (none)
               Type:  bug       |            Status:  new
           Priority:  normal    |         Milestone:  8.6.1
          Component:  Compiler  |           Version:  8.4.3
           Keywords:            |  Operating System:  Unknown/Multiple
       Architecture:  x86       |   Type of failure:  None/Unknown
          Test Case:            |        Blocked By:
           Blocking:            |   Related Tickets:
Differential Rev(s):            |         Wiki Page:
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 I am seeing the `heapprof001` testcase segmentation fault in the
 `prof_hc_hb` testsuite way on i386. For instance,
 https://circleci.com/gh/ghc/ghc/7104.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15382>
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