Add test for line number in HEREDOC with method call #1656

Job	Run time
RuboCop	25s
specs (ubuntu, 3.0.6)	1m 27s
specs (ubuntu, 3.1.4)	1m 30s
specs (ubuntu, 3.2.2)	1m 24s
specs (ubuntu, 3.3.0)	1m 26s
specs (macos, 3.0.6)	1m 44s
specs (macos, 3.1.4)	1m 24s
specs (macos, 3.2.2)	1m 9s
specs (macos, 3.3.0)	1m 10s
specs (windows, 3.0.6)	4m 35s
specs (windows, 3.1.4)	4m 17s
specs (windows, 3.2.2)	4m 17s
specs (windows, 3.3.0)	3m 38s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 21s
	29m 47s

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