PATCH: Fix atomic.h for i486

[Ulrich Drepper]

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H. J. Lu wrote:
> I think this patch fixes atomic.h for i486. "make check" passes for me
> on i686.

I have changes for the test and include/atomic.h instead.  The x86
semantics was definitely what I had in mind initially.

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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
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