x86: atomic.h memory clobbers

[John Sheu]

Looking at include/asm-i386/atomic.h, is there any particular reason
why "memory" is in the clobber list for, say, atomic_sub_and_test, and
not atomic_sub?  As far as I can tell, all the possible memory
operands are already in the in/out lists, and any memory-barrier
concerns (if any) that happen to atomic_sub_and_test should apply
equally for atomic_sub.

-John Sheu
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