new syscall stub for ia64 linux

[Jakub Jelinek]

On Tue, Jan 14, 2003 at 08:15:02AM +0000, Ulrich Drepper wrote:
> This change makes no sense.  The initial comment about removing the
> union on ia64 is there because of the requirement that tp points a
> location containing the DTV pointer, followed by some other 8 bytes.
> I.e., the dtv pointer in the union is not necessary.
> 
> How and where the thread descriptor (not TCB in ia64 speak) is stored
> remains to be seen.  I haven't looked closely enough to see what Jakub did.

I left p_header as is on IA-64 because I did not want to conditionalize
all setters in the first phase.
It makes sense to have some kind of p_header at the end on DTV arches,
which need to contain at least multiple_threads and this sysinfo on IA-64.

	Jakub