appendStabSymbol

fn appendStabSymbol(
    symbols: *std.ArrayList(Symbol),
    symbol_names: *std.array_hash_map.String(void),
    strings: []const u8,
    last_sym: Symbol,
) void {
    const name = std.mem.sliceTo(strings[last_sym.strx..], 0);
    const gop = symbol_names.getOrPutAssumeCapacity(name);
    if (!gop.found_existing) {
        assert(gop.index == symbols.items.len);
        symbols.appendAssumeCapacity(last_sym);
    } else {
        symbols.items[gop.index] = last_sym;
    }
}