private void createVirtualBaseTables() {
		for (Map.Entry<String, Address> entry : addressByMangledName.entrySet()) {
			Address address = entry.getValue();
			createVirtualBaseTable(address);
		}
	}
Returns the offset from the virtual base table entry
@param address Address of virtual base table
@param ordinal index into table
@param size size of a vbt entry offset value
@return the offset
@throws PdbException if no table exists for address or no entry exists for ordinal
Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/PdbVbtManager.java