Allow loading multiple irb files #3414

Job	Run time
lint	11s
ruby-versions / Generate Ruby versions	3s
vterm-yamatanooroti 2.7 (latest reline)	1m 4s
rake test 2.7 (latest reline)	1m 15s
vterm-yamatanooroti 2.7	2m 17s
rake test 2.7	1m 25s
vterm-yamatanooroti 3.0 (latest reline)	3m 28s
rake test 3.0 (latest reline)	1m 20s
vterm-yamatanooroti 3.0	3m 12s
rake test 3.0	1m 15s
vterm-yamatanooroti 3.1 (latest reline)	1m 1s
rake test 3.1 (latest reline)	1m 29s
vterm-yamatanooroti 3.1	1m 47s
rake test 3.1	1m 36s
vterm-yamatanooroti 3.2 (latest reline)	2m 6s
rake test 3.2 (latest reline)	1m 10s
vterm-yamatanooroti 3.2	1m 48s
rake test 3.2	1m 7s
rake test 3.3 (latest reline)	1m 14s
vterm-yamatanooroti 3.3 (latest reline)	3m 24s
rake test 3.3	1m 13s
vterm-yamatanooroti 3.3	59s
vterm-yamatanooroti head (latest reline)	1m 23s
rake test head (latest reline)	1m 18s
rake test head	1m 33s
vterm-yamatanooroti head	2m 27s
rake test truffleruby-head (latest reline)	2m 54s
rake test truffleruby-head	2m 43s
	46m 42s

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