Fix specs for Kernel#raise and supress Rubocop warnings #2503

Job	Run time
RuboCop	50s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 32s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 44s
specs (ubuntu, 4.0.4, --repeat 2)	2m 14s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 17s
specs (windows, 3.4.9)	3m 20s
specs (ubuntu, 3.3.11)	1m 39s
specs (windows, 4.0.4)	3m 53s
specs (macos, 3.3.11)	1m 55s
specs (macos, 4.0.4)	2m 2s
specs (ubuntu, 3.4.9)	1m 41s
specs (macos, 3.4.9)	1m 50s
specs (ubuntu, 4.0.4)	1m 34s
specs (windows, 3.3.11)	2m 51s
	28m 22s

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