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dim
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2014-02-20T22:31:45.844006Z
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Pull in r200453 from upstream llvm trunk:

  Implement SPARCv9 atomic_swap_64 with a pseudo.

  The SWAP instruction only exists in a 32-bit variant, but the 64-bit
  atomic swap can be implemented in terms of CASX, like the other
  atomic rmw primitives.

Submitted by:	rdivacky

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