public static DataType getDataType(Program program) {
		// Create simple data types for RTTI 1 &  RTTI 3.
		DataType rtti3Dt = getSimpleDataType(program);
		DataType rtti1Dt = Rtti1Model.getSimpleDataType(program);
		// Now make each refer to the other.
		setRtti1DataType(rtti3Dt, program, rtti1Dt);
		Rtti1Model.setRtti3DataType(rtti1Dt, program, rtti3Dt);
		return MSDataTypeUtils.getMatchingDataType(program, rtti3Dt);
	}
This gets the ClassHierarchyDescriptor (RTTI 3) structure for the indicated program.
@param program the program which will contain this data type. 
@return the ClassHierarchyDescriptor (RTTI 3) structure.
Ghidra/Features/MicrosoftCodeAnalyzer/src/main/java/ghidra/app/cmd/data/rtti/Rtti3Model.java