Information object set RANAP-ELEMENTARY-PROCEDURES is a union of
RANAP-ELEMENTARY-PROCEDURES-CLASS-1 and RANAP-ELEMENTARY-PROCEDURES-CLASS-2.

Each time _asn1f_assign_cell_value() parses an object, value of an
incremented counter is assigned to '_type_unique_index' field for
distinquishing different items.

However, these two information object sets have their own counters.
It has chance that generated variables have the same name and also the same
'_type_unique_index'. And they collide if they join up into one set.

S1AP's ASN.1 is lucky without this problem, while RANAP has.

By adding the number of items of the first set to '_type_unique_index' field
of items of the second set can solve this issue.