private static Address findTypeInfoVftableLabel(Program program) {
		SymbolTable symbolTable = program.getSymbolTable();
		Namespace typeinfoNamespace =
			symbolTable.getNamespace(TYPE_INFO_NAMESPACE, program.getGlobalNamespace());
		Symbol vftableSymbol =
			symbolTable.getLocalVariableSymbol("vftable", typeinfoNamespace);
		if (vftableSymbol != null) {
			return vftableSymbol.getAddress();
		}

		vftableSymbol = symbolTable.getLocalVariableSymbol("`vftable'", typeinfoNamespace);
		if (vftableSymbol != null) {
			return vftableSymbol.getAddress();
		}

		vftableSymbol = symbolTable.getLocalVariableSymbol("type_info", typeinfoNamespace);
		if (vftableSymbol != null) {
			return vftableSymbol.getAddress();
		}

		return null;
	}
find type info vftable by existing type_info::vftable symbol
@param program program to check
@return return vftable addr if symbol exists
Ghidra/Features/MicrosoftCodeAnalyzer/src/main/java/ghidra/app/cmd/data/rtti/RttiUtil.java