long getOffset() {
			return offset;
		}
Returns the offset from the virtual base table entry
@param address Address of virtual base table
@param ordinal index into table
@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/VbtManager.java