9 files declare their use of CacheTagsInvalidatorInterface in Zircon Profile 8

ConfigCacheTag.php in core/modules/system/src/EventSubscriber/ConfigCacheTag.php

Contains \Drupal\system\EventSubscriber\ConfigCacheTag.

ElementInfoManager.php in core/lib/Drupal/Core/Render/ElementInfoManager.php

Contains \Drupal\Core\Render\ElementInfoManager.

EntityFieldManagerTest.php in core/tests/Drupal/Tests/Core/Entity/EntityFieldManagerTest.php

Contains \Drupal\Tests\Core\Entity\EntityFieldManagerTest.

EntityTypeBundleInfoTest.php in core/tests/Drupal/Tests/Core/Entity/EntityTypeBundleInfoTest.php

Contains \Drupal\Tests\Core\Entity\EntityTypeBundleInfoTest.

LocaleTranslationCacheTag.php in core/modules/locale/src/EventSubscriber/LocaleTranslationCacheTag.php

Contains \Drupal\locale\EventSubscriber\LocaleTranslationCacheTag.

MenuTreeStorage.php in core/lib/Drupal/Core/Menu/MenuTreeStorage.php

Contains \Drupal\Core\Menu\MenuTreeStorage.

RouteProvider.php in core/lib/Drupal/Core/Routing/RouteProvider.php

Contains \Drupal\Core\Routing\RouteProvider.

Token.php in core/lib/Drupal/Core/Utility/Token.php

Contains \Drupal\Core\Utility\Token.

UnitTestCase.php in core/tests/Drupal/Tests/UnitTestCase.php

Contains \Drupal\Tests\UnitTestCase.