14 files declare their use of Alias in Zircon Profile 8

AutoAliasServicePass.php in vendor/symfony/dependency-injection/Compiler/AutoAliasServicePass.php

BackendCompilerPass.php in core/lib/Drupal/Core/DependencyInjection/Compiler/BackendCompilerPass.php

Contains \Drupal\Core\DependencyInjection\Compiler\BackendCompilerPass.

BackendCompilerPassTest.php in core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/BackendCompilerPassTest.php

Contains \Drupal\Tests\Core\DependencyInjection\Compiler\BackendCompilerPassTest.

ContainerBuilderTest.php in vendor/symfony/dependency-injection/Tests/ContainerBuilderTest.php

DecoratorServicePass.php in vendor/symfony/dependency-injection/Compiler/DecoratorServicePass.php

DecoratorServicePassTest.php in vendor/symfony/dependency-injection/Tests/Compiler/DecoratorServicePassTest.php

IntegrationTest.php in vendor/symfony/dependency-injection/Tests/Compiler/IntegrationTest.php

ResolveReferencesToAliasesPass.php in vendor/symfony/dependency-injection/Compiler/ResolveReferencesToAliasesPass.php

ServiceReferenceGraphNode.php in vendor/symfony/dependency-injection/Compiler/ServiceReferenceGraphNode.php

XmlDumper.php in vendor/symfony/dependency-injection/Dumper/XmlDumper.php

XmlFileLoader.php in vendor/symfony/dependency-injection/Loader/XmlFileLoader.php

YamlDumper.php in vendor/symfony/dependency-injection/Dumper/YamlDumper.php

YamlFileLoader.php in vendor/symfony/dependency-injection/Loader/YamlFileLoader.php

YamlFileLoader.php in core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php

Contains \Drupal\Core\DependencyInjection\YamlFileLoader.