[GHC] #5814: LLVM 3.0 doesn't support llvm.memory.barrier

[GHC]

#5814: LLVM 3.0 doesn't support llvm.memory.barrier
------------------------------+---------------------------------------------
 Reporter:  bgamari           |          Owner:  dterei          
     Type:  bug               |         Status:  new             
 Priority:  normal            |      Component:  Compiler (LLVM) 
  Version:  7.2.2             |       Keywords:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown      |       Testcase:                  
Blockedby:                    |       Blocking:                  
  Related:                    |  
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 Support for the llvm.memory.barrier intrinsic was removed in LLVM 3.0
 [http://llvm.org/releases/3.0/docs/Atomics.html] due to the introduction
 of the new "fence" instruction. The LLVM code generator should be updated
 accordingly.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5814>
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