SPARC32: Fix over-optimization by GCC near ip_fast_csum.

In some cases such as:
        iph->check = 0;
        iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
GCC may optimize out the previous store.

Observed as a failure of NFS over udp (bad checksums on ip fragments)
when compiled with GCC 3.4.2.
Signed-off-by: Bob Breuer <breuerr@mc.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

include/asm-sparc/checksum.h

@@ -159,7 +159,7 @@ static inline unsigned short ip_fast_csum(const unsigned char *iph,
 			     "xnor\t%%g0, %0, %0"
 			     : "=r" (sum), "=&r" (iph)
 			     : "r" (ihl), "1" (iph)
-			     : "g2", "g3", "g4", "cc");
+			     : "g2", "g3", "g4", "cc", "memory");
 	return sum;
 }