public void register(Label label, List<StackSize> stackSizes) {
        sizes.put(label, stackSizes);
    }
public void register ( Label label , List < StackSize > stackSizes ) { sizes . put ( label , stackSizes ) ; }
Explicitly registers a label to define a given stack state.

@param label      The label to register a stack state for.
@param stackSizes The stack sizes to assume when reaching the supplied label.