[PATCH] Atomics: emit cmpxchg instructions with weaker failure-order

[Tim Northover]

  Hi JF,

  Thanks for taking a look. Your comments were all sensible (though that extra test was a nightmare to get right).

  Does it look OK now?

  Cheers.

  Tim.

http://llvm-reviews.chandlerc.com/D3053

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D3053?vs=7769&id=7808#toc

Files:
  lib/CodeGen/CGAtomic.cpp
  test/CodeGen/atomic-ops.c
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