patch applied (ghc-6.6/ghc): use " lock cmpxchg" instead of " lock/cmpxchg"

[Wolfgang Thaller]

> Fri Nov 17 03:44:29 PST 2006  Simon Marlow <simonmar at microsoft.com>
>   * use "lock cmpxchg" instead of "lock/cmpxchg"
>   I'm not sure where the latter version came from, but it apparently
>   doesn't generate a legal instruction on Solaris.
>
>     M ./includes/SMP.h -1 +1

It came from Mac OS X.

> Sun Mar  5 19:48:20 PST 2006  wolfgang.thaller at gmx.net
>   * Use Darwin-compatible x86 assembly syntax in SMP.h (lock/ 
> cmpxchg with a slash)
>
>     M ./ghc/includes/SMP.h -1 +1

Apple's assembler doesn't accept the "lock cmpxchg" syntax, only  
"lock/cmpxchg" and "lock\ncmpxchg". So does that leave "lock 
\ncmpxchg", or is that a Mac-only thing, and we need #ifdefs?

Cheers,

Wolfgang