public DataType getDataType(long dieOffset, DataType defaultValue) {
		DataTypePath dtp = offsetToDTP.get(dieOffset);
		DataType result = (dtp != null) ? dataTypeManager.getDataType(dtp) : null;
		return (result != null) ? result : defaultValue;
	}
Returns a Ghidra {@link DataType} corresponding to the specified DIE (based on its
offset), or the specified defaultValue if the DIE does not map to a defined
datatype (registered with {@link #addDataType(long, DataType, DWARFSourceInfo)}).

@param dieOffset offset of a DIE record that defines a data type
@param defaultValue Ghidra {@link DataType} to return if the specified DIE not already defined.
@return Ghidra {@link DataType}
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFDataTypeManager.java