Merge pull request #1198 from herwinw/marshal_utf8_names #1751

Job	Run time
RuboCop	27s
specs (ubuntu, 3.0.6)	1m 35s
specs (ubuntu, 3.1.4)	1m 37s
specs (ubuntu, 3.2.2)	1m 31s
specs (ubuntu, 3.3.0)	1m 29s
specs (macos, 3.0.6)	1m 20s
specs (macos, 3.1.4)	1m 27s
specs (macos, 3.2.2)	1m 15s
specs (macos, 3.3.0)	1m 6s
specs (windows, 3.0.6)	4m 59s
specs (windows, 3.1.4)	4m 46s
specs (windows, 3.2.2)	4m 25s
specs (windows, 3.3.0)	5m 24s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 29s
	32m 50s

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