@Override
	public String getTypeName() {
		return "_EMPTY_PARAMETER_TYPE_";
	}
This class represents an empty parameter.  (The $$V code.)  Not sure what/how it fits into
everything, but coding it up for now.
It is one of a number of "extended" data types not originally planned by Microsoft.
Ghidra/Features/MicrosoftDmang/src/main/java/mdemangler/datatype/modifier/MDEmptyParameterType.java