Add initial specs for IO::Buffer #2125

Job	Run time
RuboCop	57s
specs (macos, 3.4.7)	1m 44s
specs (ubuntu, 3.3.9)	1m 30s
specs (macos, 3.2.9)	1m 29s
specs (macos, 3.3.9)	1m 18s
specs (ubuntu, 3.2.9)	1m 30s
specs (ubuntu, 3.4.7)	1m 43s
specs (ubuntu, 3.4.7, --enable-frozen-string-literal)	1m 34s
specs (windows, 3.4.7)	3m 37s
specs (windows, 3.2.8)	3m 28s
specs (windows, 3.3.9)	3m 14s
specs (ubuntu, 3.4.7, --parser=parse.y)	1m 39s
	23m 43s

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