@Override
	public String getDefaultLabelPrefix() {
		return "RTTI_2";
	}
Determines if the RTTI 1 pointer in the RTTI2 structure is valid.
@param program the program
@param startAddress the address of the RTTI 2 structure
@param pointerIndex index of the element in the array that makes up the RTTI 2.
@param validationOptions options indicating how to perform the validation
@return true if the indicated RTTI1 pointer is valid.
Ghidra/Features/Base/src/main/java/ghidra/app/util/datatype/microsoft/RTTI2DataType.java