public DIEAggregate getRef(DWARFAttribute attribute) {
		DebugInfoEntry die = getRefDIE(attribute);
		return getProgram().getAggregate(die);
	}
Returns the {@link DIEAggregate diea} instance pointed to by the requested attribute,
or null if the attribute does not exist.

@param attribute {@link DWARFAttribute} id
@return {@link DIEAggregate}, or the null if attribute is not present
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DIEAggregate.java