@Override
	public void emit(StringBuilder builder) {
		builder.append(
			"Placeholder VFT for the following classes within owner:\n   " + owner + "\n");
		builder.append(String.format("For Classes:\n"));
		for (ClassID id : parentage) {
			builder.append(String.format("   %-10s\n", id.toString()));
		}
		builder.append("VftPtrOffset within Owner" + ptrOffsetInClass + "\n");
		PlaceholderVirtualFunctionTableEntry.emitHeader(builder);
		for (int tableIndex : entriesByTableIndex.keySet()) {
			entry(tableIndex).emit(builder, ptrOffsetInClass);
		}
	}
Constructor.
Virtual Function Table for a base (parent) class within an owner class.  The owner and parent
class can be null if not known, but methods are offered to fill them in if/when this
information becomes available
@param owner class that owns this VBT (can own more than one); can be {@code null}
@param parentage parentage for which this VFT is used; can be {@code null}
Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/PlaceholderVirtualFunctionTable.java