Fix Issues with cmpxchg example

[Daniel Robertson via llvm-commits]

> Can you give a bit more context, including what project you're
> contributing to?  Also, you might want to look through the logs of
> that project and CC one of the main contributors.

No problem, I probably should have done that to start with :-)

It is ment for the llvm project as the docs corrected are from
`http://llvm.org/svn/llvm-project/llvm/trunk llvm`. Let me know if you
need more information.

`git log --author=dexonsmith at apple.com --oneline | wc -l` yielded
`1149`. So I Cc'd you :-)

Again, please let me know if I've done something wrong

Cheers,

Daniel
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