[3.3/mainline] Fix x86-64 varargs

[Jan Hubicka]

Hi,
I've bootstrapped/regtested and installed the attached fix.  In the case
where temporary space is needed we used to produce invalid instruction
as we overwrite address variable via stack slot address.

Honza

Sat Jun 21 13:37:26 CEST 2003  Jan Hubicka  <jh@suse.cz>
	* i386.c (ix86_va_arg): Fix allocation of temporary slot.
*** i386.c	Wed Jun 11 17:23:18 2003
--- /aux/hubicka/hammer/gcc/gcc/config/i386/i386.c	Tue Jun 17 21:44:49 2003
*************** ix86_va_arg (valist, type)
*** 2884,2893 ****
  	{
  	  int i;
  	  rtx mem;
  
  	  /* Never use the memory itself, as it has the alias set.  */
! 	  addr_rtx = XEXP (assign_temp (type, 0, 1, 0), 0);
! 	  mem = gen_rtx_MEM (BLKmode, addr_rtx);
  	  set_mem_alias_set (mem, get_varargs_alias_set ());
  	  set_mem_align (mem, BITS_PER_UNIT);
  
--- 2972,2983 ----
  	{
  	  int i;
  	  rtx mem;
+ 	  rtx x;
  
  	  /* Never use the memory itself, as it has the alias set.  */
! 	  x = XEXP (assign_temp (type, 0, 1, 0), 0);
! 	  mem = gen_rtx_MEM (BLKmode, x);
! 	  force_operand (x, addr_rtx);
  	  set_mem_alias_set (mem, get_varargs_alias_set ());
  	  set_mem_align (mem, BITS_PER_UNIT);