protected DebugInfoEntry addTypedef(String name, DebugInfoEntry die) {
		ensureCompUnit();
		return new DIECreator(dwarfProg, DW_TAG_typedef).addString(DW_AT_name, name)
				.addRef(DW_AT_type, die)
				.create();
	}
Base class for unit tests needing DWARF DIEs.  Provides 2 DWARF compile-units and helper
methods to create DIE records.
Ghidra/Features/Base/src/test/java/ghidra/app/util/bin/format/dwarf/DWARFTestBase.java