These routines perform service operations
on linear structures.
The parameter LLS is the address of the first bank
of the linear structure.
reverses the order of the banks in the linear structure,
ie. the first bank becomes the last, and the last the first,
for walking through the structure with L=LQ(L).
Starting with Zebra version 3.67, LLS is updated to point to
the first bank of the inverted structure on return.
removes by bridging dead banks still present
in the linear structure pointed to by LLS.