/usr/share/php/Symfony/Component/DependencyInjection/Compiler/ is in php-symfony-dependency-injection 2.3.21+dfsg-4+deb8u3.
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/usr/share/php/Symfony/Component/DependencyInjection/Compiler/AnalyzeServiceReferencesPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/CheckCircularReferencesPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/CheckDefinitionValidityPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/CheckExceptionOnInvalidReferenceBehaviorPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/CheckReferenceValidityPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/Compiler.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/CompilerPassInterface.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/InlineServiceDefinitionsPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/LoggingFormatter.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/RemoveAbstractDefinitionsPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/RemovePrivateAliasesPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/RemoveUnusedDefinitionsPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/RepeatablePassInterface.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/RepeatedPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/ReplaceAliasByActualDefinitionPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/ResolveDefinitionTemplatesPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/ResolveInvalidReferencesPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/ResolveReferencesToAliasesPass.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/ServiceReferenceGraph.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/ServiceReferenceGraphEdge.php
/usr/share/php/Symfony/Component/DependencyInjection/Compiler/ServiceReferenceGraphNode.php