IRB hangs when autocompleting require_relative path at root directory

Description

When you run irb in root directory and tries to autocomplete require_relative path, IRB hangs.
IRB tries to search every directory in your system.
In my environment, it stops after few seconds with Errno::EPERM. Similar to #606

$ cd /
$ irb
irb(main):001> require_relative 'a

Result of irb_info

irb(main):001> irb_info
Ruby version: 3.2.2
IRB version: irb 1.9.0 (2023-11-11)
InputMethod: RelineInputMethod with Reline 0.4.0
Completion: Autocomplete, RegexpCompletor
RUBY_PLATFORM: arm64-darwin22
LANG env: ja_JP.UTF-8
East Asian Ambiguous Width: 1

Terminal Emulator

Terminal.app

Setting Files

Are you using ~/.irbrc and ~/.inputrc?
No

Reproduce the hang by running irb from the root directory and entering require_relative 'a. Start by tracing the autocomplete path search and its handling of the root directory and permission errors. Done means completion no longer searches indefinitely or hangs, while require_relative completion still works normally.