[lto] Use num_parm_types and nth_parm_type in type_num_arguments.

[Kazu Hirata]

Hi,

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

Kazu Hirata

2006-07-15  Kazu Hirata  <kazu@codesourcery.com>

	* tree.c (type_num_arguments): Use num_parm_types and
	nth_parm_type.

Index: tree.c
===================================================================
*** tree.c	(revision 115362)
--- tree.c	(working copy)
***************
*** 4341,4358 ****
  int
  type_num_arguments (tree type)
  {
!   int i = 0;
!   tree t;
  
!   for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t))
!     /* If the function does not take a variable number of arguments,
!        the last element in the list will have type `void'.  */
!     if (VOID_TYPE_P (TREE_VALUE (t)))
!       break;
!     else
!       ++i;
  
!   return i;
  }
  
  /* Nonzero if integer constants T1 and T2
--- 4341,4353 ----
  int
  type_num_arguments (tree type)
  {
!   tree parm_types = TYPE_ARG_TYPES (type);
!   int len = num_parm_types (parm_types);
  
!   if (len && VOID_TYPE_P (nth_parm_type (parm_types, len - 1)))
!     len--;
  
!   return len;
  }
  
  /* Nonzero if integer constants T1 and T2