Fix Issues with cmpxchg example

[Duncan P. N. Exon Smith via llvm-commits]

> On 2016-Feb-06, at 14:25, Daniel Robertson via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> Reading through the documentation and found that the example for
> cmpxchg didn't work. The attached patch addresses that and was generated
> with `git format-patch --no-attach master..localbranch`. I appologize
> if this is the wrong mailing list. The documentation here
> (http://llvm.org/docs/DeveloperPolicy.html) stated that one-off patches
> could be sent here.
> 

This might be the right list, but it's not actually clear what
project this commit is intended for so it's hard to say for
sure ;).

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.

> Cheers,
> 
> Daniel
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