- Make it easier to maintain the Ultra-I vs. Ultra-III
  memcpy implementations.  Before you had to maintain
  3 different entire copies of the routines.
- Kill %asi register writing Ultra-I single memcpy loop
  for both user and kernel.  Was not worth it.
- Simplify exception detection and handling enormously.
Signed-off-by: David S. Miller <davem@redhat.com>