* fold-const.c (fold_unary): Convert (T1)(X op Y) into ((T1)X op (T1)Y),
	for pointer type in more cases than before.

	* gimplify.c (gimplify_expr): Fold (void *)&a + 4.

	* tree-object-size.c (plus_expr_object_size): When operand size is
	unknown, return unknown.

From-SVN: r124403