[GHC] #8402: throwTo segfaults under -prof -threaded -with-rtsopts=N2

[GHC]

#8402: throwTo segfaults under -prof -threaded -with-rtsopts=N2
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        Reporter:  akio           |            Owner:
            Type:  bug            |           Status:  new
        Priority:  highest        |        Milestone:  7.8.1
       Component:  Profiling      |          Version:  7.7
      Resolution:                 |         Keywords:
Operating System:  Linux          |     Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:                 |       Blocked By:
        Blocking:                 |  Related Tickets:
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Changes (by akio):

 * owner:  simonmar =>
 * status:  closed => new
 * resolution:  fixed =>


Comment:

 I think the current condition is wrong because it zeros slop when
 {{{THREADED && PROFILING && DEBUG}}}. This causes the test case for #8453
 to segfault.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8402#comment:16>
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