Re: s_lock.h cleanup

Done and applied.

> As long as we're cleaning things up, I would suggest that all the ports
> that use gcc assembler be made to declare it uniformly, as
>
>     __asm__ __volatile__ ( ... );
>
> As I read the GCC manual, there's some risk of the asm sections getting
> moved around in the program flow if they are not marked volatile.  Also
> we oughta be consistent about using the double-underscore keywords IMHO.
>
>             regards, tom lane
>


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