public DataType getDataType(Program program) {
		DataType rtti1Dt = Rtti1Model.getDataType(program);
		return getDataType(program, rtti1Dt);
	}
This gets the BaseClassArray (RTTI 2) structure for the indicated program.
@param program the program which will contain this data type. 
@return the BaseClassArray (RTTI 2) structure or null.
Ghidra/Features/MicrosoftCodeAnalyzer/src/main/java/ghidra/app/cmd/data/rtti/Rtti2Model.java