Support helper method registration #2333

Job	Run time
ruby-versions / Generate Ruby versions	2s
rake test 2.7 (latest reline)	44s
rake test 2.7	42s
rake test 3.0 (latest reline)	37s
rake test 3.0	36s
rake test 3.1 (latest reline)	38s
rake test 3.1	33s
rake test 3.2 (latest reline)	26s
rake test 3.2	36s
rake test head (latest reline)	31s
rake test head	27s
rake test truffleruby-head (latest reline)	5m 24s
rake test truffleruby-head	5m 33s
vterm-yamatanooroti 2.7 (latest reline)	2m 38s
vterm-yamatanooroti 2.7	2m 49s
vterm-yamatanooroti 3.0 (latest reline)	2m 24s
vterm-yamatanooroti 3.0	2m 19s
vterm-yamatanooroti 3.1 (latest reline)	2m 21s
vterm-yamatanooroti 3.1	2m 23s
vterm-yamatanooroti 3.2 (latest reline)	2m 18s
vterm-yamatanooroti 3.2	2m 24s
vterm-yamatanooroti head (latest reline)	2m 22s
vterm-yamatanooroti head	2m 26s
	41m 13s

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