Move main object's safe call logic to Context #4089

Job	Run time
lint	9s
Debug compatibility test	5m 45s
ruby-versions / Generate Ruby versions	3s
rake test 2.7 (latest reline)	1m 32s
vterm-yamatanooroti 2.7 (latest reline)	43s
rake test 2.7	1m 30s
rake test 3.0 (latest reline)	1m 34s
vterm-yamatanooroti 2.7	52s
vterm-yamatanooroti 3.0 (latest reline)	31s
rake test 3.0	1m 23s
rake test 3.1 (latest reline)	1m 29s
vterm-yamatanooroti 3.0	1m 16s
rake test 3.1	1m 26s
vterm-yamatanooroti 3.1 (latest reline)	30s
rake test 3.2 (latest reline)	1m 24s
vterm-yamatanooroti 3.1	32s
rake test 3.2	1m 29s
vterm-yamatanooroti 3.2 (latest reline)	33s
rake test 3.3 (latest reline)	1m 23s
vterm-yamatanooroti 3.2	30s
rake test 3.3	1m 27s
vterm-yamatanooroti 3.3 (latest reline)	29s
rake test head (latest reline)	1m 49s
vterm-yamatanooroti 3.3	29s
rake test head	1m 48s
vterm-yamatanooroti head (latest reline)	32s
rake test truffleruby-head (latest reline)	31s
vterm-yamatanooroti head	41s
rake test truffleruby-head	35s
	32m 55s

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