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