fix ia64 longjmp() to work from alternate signal-stack

[David Mosberger]

>>>>> On Thu, 26 Aug 2004 02:24:01 -0700, Ulrich Drepper <drepper@redhat.com> said:

  Uli> I don't like this.  The behavior of longjmp if the starting point is
  Uli> using the alternate stack while the destination uses the normal stack,
  Uli> is currently unspecified in POSIX.  I've asked for clarification in the
  Uli> POSIX working group.  The result I expect is "don't do it", aka,
  Uli> unspecified.

Were you able to get clarification on this issue already?

Thanks,

	--david