public void addType(DataType dataType) {
		if (dataType == null) {
			return;
		}
		inputSet.add(createEntry(dataType));
		processed = false;
	}
This method adds a single DataTypes to the input DataType list and
 marks the data as dirty (all must need recalculated).
@param dataType  A single DataType to add to the input DataType list.
Ghidra/Features/Decompiler/src/main/java/ghidra/app/util/DataTypeDependencyOrderer.java