fix libgomp miscompilation on ppc64

[Mark Mitchell]

Jakub Jelinek wrote:

> Yes, since libstdc++-v3 was not using the __sync_* builtins internally
> in GCC 4.0.x and earlier, but used inline assembly instead for the atomic
> stuff.  We only saw the bug in libgomp so far, so it is possible in
> libstdc++-v3 we are just lucky enough to not expose it.  Though it is
> unclear if GCC 4.1's libstdc++-v3 has been tested with all the compile
> flags combinations people will be actually using.

OK, go ahead and apply the patch.

Thanks,

-- 
Mark Mitchell
CodeSourcery
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