DataType getBaseClassDataTypeOrSchedule(RecordNumber recordNumber) {
		RecordNumber mappedNumber = getMappedRecordNumber(recordNumber);
		boolean filledIn = filledInStructure.contains(mappedNumber);
		DataType dt = dataTypeByMsTypeNum.get(mappedNumber);
		if (dt != null && filledIn) {
			return dt;
		}
		multiphaseResolver.scheduleTodo(mappedNumber);
		return null;
	}
Returns the Ghidra data type associated with the PDB record number for the base class
of another class.  In this case, we require the base class structure to be completed
in order for the child class to be constructed
This method is intended to be used by appliers that work on this specific type, not by
 appliers that need the data type
@param recordNumber the PDB type record number
@return the Ghidra DB data type of the base class
Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/DefaultPdbApplicator.java