new syscall stub support for ia64 libc

[David Mosberger]

>>>>> On Fri, 14 Nov 2003 12:29:28 -0800, Ulrich Drepper <drepper@redhat.com> said:

  >> Which tests specifically?

  Uli> Tons of them.  tst-mutex8, tst-cond7, ...  Don't have the
  Uli> complete list.  The interesting part is that they abort, not
  Uli> crash.

OK, it looks to me like the unwinder is failing.  I suspect it's
choking either on the .altrp directive or on the unwind directives for
the signal trampoline.  I plugged libunwind into libgcc_s.so.1 and now
tst-mutex8, tst-cancel6, and many other tests are working fine.  I
still have some others failing (basic4, stack{1,2},
cancelx{4,5,10,16,17,18}, cleanupx{0,1,3,4}, and oncex{3,4}), but I
don't understand the problem there yet and I'll need to look into
those next week.

	--david