[GHC] #7883: enable GHC LLVM backend to use LLVM provided CAS / Atomicity primitives?

[GHC]

#7883: enable GHC LLVM backend to use LLVM provided CAS / Atomicity primitives?
-------------------------------------+-------------------------------------
        Reporter:  carter            |                Owner:  carter
            Type:  task              |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.9
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1282
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * status:  new => patch
 * differential:   => Phab:D1282


Comment:

 I have Phab:D1282 up on Phabricator covering this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7883#comment:24>
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