Jun Aruga 3504be1bc1 [ruby/irb] Require RDoc in input-method.rb again in a limited scope.
RDoc is implemented as soft dependency in IRB. See how the rdoc is required in
the files. I reverted the commit below.

```
$ grep -ril rdoc lib/
lib/irb/cmd/help.rb
lib/irb/completion.rb
lib/irb/easter-egg.rb
lib/irb/input-method.rb
```

---

Revert "Remove `require` in signal handler to avoid ThreadError"

This reverts commit https://github.com/ruby/irb/commit/5f749c613c89.

https://github.com/ruby/irb/commit/b24852058f
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