[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:
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Comment (by lukexi):

 Actually, __clear_cache seems to be missing entirely on iOS, so I'm not
 sure what to do here.

 (I found a reference to someone reimplementing it in assembly?
 http://permalink.gmane.org/gmane.comp.lang.pcre.devel/1986)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8561#comment:1>
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