[patch] Use num_parm_types and nth_parm_type_ptr in walk_type_fields.

[Kazu Hirata]

Hi,

Tested on x86_64-pc-linux-gnu.  Committed to the LTO branch as
obvious.

Kazu Hirata

2006-07-20  Kazu Hirata  <kazu@codesourcery.com>

	* tree.c (walk_type_fields): Use num_parm_types and
	nth_parm_type_ptr.

Index: tree.c
===================================================================
--- tree.c	(revision 115576)
+++ tree.c	(working copy)
@@ -7310,11 +7310,13 @@ walk_type_fields (tree type, walk_tree_f
     case FUNCTION_TYPE:
       WALK_SUBTREE (TREE_TYPE (type));
       {
-	tree arg;
+	tree parm_types = TYPE_ARG_TYPES (type);
+	int len = num_parm_types (parm_types);
+	int i;
 
 	/* We never want to walk into default arguments.  */
-	for (arg = TYPE_ARG_TYPES (type); arg; arg = TREE_CHAIN (arg))
-	  WALK_SUBTREE (TREE_VALUE (arg));
+	for (i = 0; i < len; i++)
+	  WALK_SUBTREE (*(nth_parm_type_ptr (parm_types, i)));
       }
       break;