use `Kernel.callee` #1785

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (2.7)	2m 3s
test (3.4)	1m 39s
test (3.0)	1m 56s
test (3.2)	1m 44s
test (3.1)	1m 44s
test (head)	1m 37s
test (debug)	6m 13s
test (3.3)	1m 46s
	18m 45s

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