protected DIECreator newFormalParam(DebugInfoEntry subprogram, String paramName,
			DebugInfoEntry paramDataType, int... locationExpr) {
		ensureCompUnit();
		DIECreator param = new DIECreator(dwarfProg, DW_TAG_formal_parameter) //
				.addRef(DW_AT_type, paramDataType)
				.setParent(subprogram);
		if (locationExpr.length > 0) {
			param.addBlock(DW_AT_location, locationExpr);
		}
		if (paramName != null) {
			param.addString(DW_AT_name, paramName);
		}
		return param;
	}
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