Fewer duplicate specs for `Kernel` methods #2461

Job	Run time
RuboCop	48s
specs (macos, 3.4.9)	1m 34s
specs (macos, 4.0.4)	1m 30s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 19s
specs (ubuntu, 3.3.11)	1m 36s
specs (ubuntu, 3.4.9)	1m 40s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 34s
specs (windows, 3.3.11)	3m 15s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 34s
specs (ubuntu, 4.0.4)	1m 28s
specs (windows, 4.0.4)	3m 47s
specs (windows, 3.4.9)	3m 28s
specs (ubuntu, 4.0.4, --repeat 2)	2m 13s
specs (macos, 3.3.11)	1m 33s
	27m 19s

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