(RTX_COSTS): Make cost of MULT depend on TARGET_V8.

From-SVN: r4650

gcc/config/sparc/sparc.h

@@ -1471,7 +1471,7 @@ extern struct rtx_def *legitimize_pic_address ();
 
 #define RTX_COSTS(X,CODE,OUTER_CODE)			\
   case MULT:						\
-    return COSTS_N_INSNS (25);				\
+    return TARGET_V8 ? COSTS_N_INSNS (5) : COSTS_N_INSNS (25);	\
   case DIV:						\
   case UDIV:						\
   case MOD:						\