[GHC] #8594: sysctl name "hw.ncpu" (HW_NCPU) is deprecated in Mac OS X

[GHC]

#8594: sysctl name "hw.ncpu" (HW_NCPU) is deprecated in Mac OS X
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        Reporter:  kseo            |            Owner:  simonmar
            Type:  task            |           Status:  new
        Priority:  normal          |        Milestone:
       Component:  Runtime System  |          Version:  7.6.3
      Resolution:                  |         Keywords:
Operating System:  MacOS X         |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown    |       Difficulty:  Unknown
       Test Case:                  |       Blocked By:
        Blocking:                  |  Related Tickets:
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Comment (by kseo):

 I've attached a patch to use hw.logicalcpu in OS X. FreeBSD still uses
 "hw.ncpu", so I split the guard. This patch does not change the behavior
 because hw.ncpu also returns the logical cpu count.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8594#comment:5>
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