Add several utility functions, make IPL_check and IPL_assert generally
available, etc.
Acked-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: NEugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>