[ruby/irb] Suppress command return values

(https://github.com/ruby/irb/pull/934)

Since commands can't be chained with methods, their return values are
not intended to be used. But if IRB keeps storing command return values
as the last value, and print them, users may rely on such implicit
behaviour.

So to avoid such confusion, this commit suppresses command's
return values. It also updates some commands that currently rely on
this implicit behaviour.

https://github.com/ruby/irb/commit/fa96bea76f

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