[GHC] #8533: Extend new getPhysicalMemorySize ifdef to ios_HOST_OS

[GHC]

#8533: Extend new getPhysicalMemorySize ifdef to ios_HOST_OS
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       Reporter:  lukexi             |             Owner:
           Type:  bug                |            Status:  new
       Priority:  high               |         Milestone:  7.8.1
      Component:  Compiler           |           Version:  7.6.3
       Keywords:                     |  Operating System:  Other
   Architecture:  arm                |   Type of failure:  Building GHC
     Difficulty:  Easy (less than 1  |  failed
  hour)                              |         Test Case:
     Blocked By:                     |          Blocking:
Related Tickets:                     |
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 A very tiny patch to extend thoughtpoice's recent commit "Fix
 getPhysicalMemorySize on OS X (#8481)" to extend the ifdef to ios_HOST_OS,
 which also requires the fix.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8533>
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