public void backrefAdd(int index, SymbolNode value) {
		backrefs.put(Integer.valueOf(index), value);
		index += 1;
	}
Adds a backref to the list
@param index the index of the backref
@param value the backref object to add
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/analysis/rust/demangler/RustDemanglerV0.java