Move remaining core specs to use fewer shared examples #2433

Job	Run time
RuboCop	48s
specs (ubuntu, 3.3.11)	1m 32s
specs (macos, 3.4.9)	1m 17s
specs (ubuntu, 4.0.4)	1m 32s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 31s
specs (windows, 3.4.9)	3m 17s
specs (macos, 4.0.4)	1m 26s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 30s
specs (macos, 3.3.11)	1m 52s
specs (ubuntu, 4.0.4, --repeat 2)	2m 20s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 32s
specs (ubuntu, 3.4.9)	1m 42s
specs (windows, 4.0.4)	3m 40s
specs (windows, 3.3.11)	3m 20s
	27m 19s

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