Eli Friedman 138515df66 First draft of the practical guide to atomics.
This is mostly descriptive of the intended state once atomic load and store have landed.  



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137145 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-09 21:07:10 +00:00
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