Drop obsolete workaround in `Range#reverse_each` #11594

Job	Run time
x86_64-gnu-test-preview_mt	5m 50s
check_format	1m 49s
deploy_api_docs	0s
x86_64-musl-test	38m 15s
x86_64-gnu-test (1.7.3)	35m 39s
x86_64-gnu-test (1.8.2)	34m 57s
x86_64-gnu-test (1.9.2)	32m 38s
x86_64-gnu-test (1.10.1)	32m 27s
x86_64-gnu-test (1.11.2)	32m 19s
x86_64-gnu-test (1.12.2)	32m 58s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 13s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 31s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	34m 33s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	34m 41s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	35m 19s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	32m 57s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	35m 28s
	8h 8m 34s

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