Add specs for Range#reverse_each #1692

Job	Run time
RuboCop	25s
specs (ubuntu, 3.0.6)	1m 31s
specs (ubuntu, 3.1.4)	1m 35s
specs (ubuntu, 3.2.2)	1m 32s
specs (ubuntu, 3.3.0)	1m 27s
specs (macos, 3.0.6)	1m 22s
specs (macos, 3.1.4)	1m 24s
specs (macos, 3.2.2)	1m 11s
specs (macos, 3.3.0)	1m 17s
specs (windows, 3.0.6)	5m 4s
specs (windows, 3.1.4)	4m 52s
specs (windows, 3.2.2)	5m 24s
specs (windows, 3.3.0)	4m 57s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 24s
	33m 25s

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