ia64: Fix __delay() to do The Right Thing. In practice, this may

	cause BogoMIPS to drop to half the clock-speed with current
	versions of GCC, but this just shows that GCC doesn't generate
	very good code for single-cycle loops.  Perhaps it will motivate
	someone to improve GCC in this area (though it's hardly of
	practical value, other than for producing large BogoMIPS values).

include/asm-ia64/delay.h

@@ -74,7 +74,7 @@ __delay (unsigned long loops)
 		return;
 
 	while (loops--)
-		ia64_nop(0);
+		barrier();
 }
 
 static __inline__ void