(store_expr): Call size_binop instead of doing the same thing with

fold and build.

From-SVN: r3993

gcc/expr.c

@@ -2399,12 +2399,12 @@ store_expr (exp, target, suggest_reg)
 	    {
 	      /* Compute the size of the data to copy from the string.  */
 	      tree copy_size
-		= fold (build (MIN_EXPR, sizetype,
+		= size_binop (MIN_EXPR,
 			      size_binop (CEIL_DIV_EXPR,
 					  TYPE_SIZE (TREE_TYPE (exp)),
 					  size_int (BITS_PER_UNIT)),
 			      convert (sizetype,
-					build_int_2 (TREE_STRING_LENGTH (exp), 0))));
+				       build_int_2 (TREE_STRING_LENGTH (exp), 0)));
 	      rtx copy_size_rtx = expand_expr (copy_size, NULL_RTX,
 					       VOIDmode, 0);
 	      rtx label = 0;