[GHC] #11978: running a profiled build of shake test suite with rts args +RTS -hb -N10 triggers SIGSEGV

[GHC]

#11978: running a profiled build of shake test suite with rts args  +RTS -hb -N10
triggers SIGSEGV
---------------------------------+----------------------------------------
        Reporter:  carter        |                Owner:
            Type:  bug           |               Status:  new
        Priority:  highest       |            Milestone:  8.0.2
       Component:  Compiler      |              Version:  8.0.1
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:  #4820         |  Differential Rev(s):  Phab:D2174
       Wiki Page:                |
---------------------------------+----------------------------------------
Changes (by carter):

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


Comment:

 This commit breaks builds on OS X 10.11.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11978#comment:31>
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