[DependencyInjection] backport perf optim

Conflicts:
	src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services11.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services19.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
[DependencyInjection] perf optim: call dirname() at most 5x
Revert "[DependencyInjection] backport perf optim"

This reverts commit c11535bd6bff6d00ac5a0206e1c8d3f508bba8f3.

Conflicts:
	src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1-1.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services12.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services8.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php
	src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php