[GHC] #8561: Clang/iOS: __builtin___clear_cache doesn't exist in clang, use __clear_cache instead

[GHC]

#8561: Clang/iOS: __builtin___clear_cache doesn't exist in clang, use
__clear_cache instead
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        Reporter:  lukexi            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  high              |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Other             |     Architecture:  Unknown/Multiple
 Type of failure:  Building GHC      |       Difficulty:  Easy (less than 1
  failed                             |  hour)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #8562
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Comment (by carter):

 i'm meh about that fixup patch, the real issue is we don't need to call
 any cache synchronization on  x86/ x86_64 architectures.

 I'll integrate the above patch into my fixup.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8561#comment:11>
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