Ensure hard reference for frozen strings (#1348) #2354

Job	Run time
RuboCop	53s
specs (ubuntu, 4.0.1, --enable-frozen-string-literal)	1m 32s
specs (windows, 3.3.10)	2m 59s
specs (ubuntu, 4.0.1, LC_ALL=C)	1m 32s
specs (ubuntu, 4.0.1)	1m 39s
specs (ubuntu, 3.3.10)	1m 37s
specs (macos, 3.3.10)	1m 38s
specs (ubuntu, 3.4.8)	1m 43s
specs (windows, 4.0.1)	3m 48s
specs (windows, 3.4.8)	3m 33s
specs (macos, 4.0.1)	1m 34s
specs (ubuntu, 4.0.1, --repeat 2)	2m 20s
specs (ubuntu, 4.0.1, --parser=parse.y)	1m 43s
specs (macos, 3.4.8)	1m 26s
	27m 57s

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