Per patch from Nathan Field at ghs.com, fix the mips __compare_and_swap inline function.  Without this fix, pthread_mutex_lock/pthread_mutex_unlock don't work on mips.
Per patch from Nathan Field at ghs.com, fix the mips __compare_and_swap inline
function.  Without this fix, pthread_mutex_lock/pthread_mutex_unlock don't work
on mips.

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