public ClassID getBaseClassId(int tableIndex) throws PdbException {
		VBTableEntry entry = entryByTableIndex.get(tableIndex);
		if (entry == null) {
			return null;
		}
		maxTableIndexSeen = Integer.max(maxTableIndexSeen, tableIndex);
		return entry.getClassId();
	}
Returns the ClassID of the base class in the layout class pertaining whose entry in the
VBTable is at the tableIndex location; the table index is based at 1
@param tableIndex the index location in the virtual base table for the entry
@return the ClassID of the base class
@throws PdbException if an entry does not exist for the tableIndex
Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VirtualBaseTable.java