[ValueTracking] isNonEqual Pointers with with a recursive GEP (#70459)

Handles canonical icmp eq(ptr1, ptr2) -> where ptr1/ptr2 is a recursive
GEP.
Can helps scenarios where InstCombineCompares folds icmp eq(sub(ptr2int,
ptr2int), 0) -> icmp eq(ptr1, ptr2)
and
icmp eq(phi(sub(ptr2int, ptr2int), ...)) -> phi i1 (icmp eq(sub(ptr2int,
ptr2int), 0), ....)