public Parameter asReturnParameter(boolean includeStorageDetail)
			throws InvalidInputException {
		VariableStorage varStorage = isVoidType()
				? VariableStorage.VOID_STORAGE
				: !isMissingStorage() && includeStorageDetail
						? getVariableStorage()
						: VariableStorage.UNASSIGNED_STORAGE;
		return new ReturnParameterImpl(type, varStorage, true, program.getGhidraProgram());
	}
If this is a static/global variable, stored at a ram address, return it's
ram address.

@return address of where this variable is stored, null if not ram address
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFVariable.java