Fix nullable constructor promotion detection #305

Job	Run time
Test: PHP 5.5 on PHPCS 3.5.6	20s
Test: PHP 5.5 on PHPCS dev-master	21s
Test: PHP 5.6 on PHPCS 3.5.6	22s
Test: PHP 5.6 on PHPCS dev-master	22s
Test: PHP 7.0 on PHPCS 3.5.6	19s
Test: PHP 7.0 on PHPCS dev-master	35s
Test: PHP 7.1 on PHPCS 3.5.6	26s
Test: PHP 7.1 on PHPCS dev-master	18s
Test: PHP 7.2 on PHPCS 3.5.6	21s
Test: PHP 7.2 on PHPCS dev-master	29s
Test: PHP 7.3 on PHPCS 3.5.6	19s
Test: PHP 7.3 on PHPCS dev-master	27s
Test: PHP 8.3 on PHPCS 3.6.1	14s
Test: PHP 8.2 on PHPCS 3.6.1	37s
Test: PHP 8.1 on PHPCS dev-master	19s
Test: PHP 8.1 on PHPCS 3.6.1	45s
Test: PHP 8.0 on PHPCS dev-master	19s
Test: PHP 8.0 on PHPCS 3.5.7	18s
Test: PHP 7.4 on PHPCS dev-master	25s
Test: PHP 8.4 on PHPCS dev-master	26s
Coverage: PHP 8.3 on PHPCS dev-master	25s
Coverage: PHP 7.4 on PHPCS 3.5.6	27s
Coverage: PHP 5.4 on PHPCS dev-master	1m 14s
Coverage: PHP 5.4 on PHPCS 3.5.6	1m 7s
coveralls-finish	4s
	11m 19s

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