[DependencyInjection] fixed a non-detected circular reference in PhpDumper (closes #8425)

This circular reference cannot be detected by the compiler pass as we
don't check for method arguments there.

The Container itself already detects such circular references at runtime.

So this fix is about circular references that are not detected at
compile time, and are not even detected at runtime because the code that
would cause the detection is never run (generated after a return
statement.)
merged branch fabpot/circular-refs-php-dumper (PR #8999)

This PR was merged into the 2.2 branch.

Discussion
----------

[DependencyInjection] fixed a non-detected circular reference in PhpDumper (closes #8425)

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8425
| License       | MIT
| Doc PR        | n/a

Commits
-------

ce7de37 [DependencyInjection] fixed a non-detected circular reference in PhpDumper (closes #8425)