…er in autowired classes (brainexe)

This PR was squashed before being merged into the 3.1 branch (closes symfony#21372).

Discussion
----------

[DependencyInjection] Fixed variadic method parameter in autowired classes

| Q             | A
| ------------- | ---
| Branch?       | 3.1
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | --
| License       | MIT

Autowiring classes containing methods with variadic method parameter throws a ReflectionException in compile process:

```
PHP Fatal error:  Uncaught ReflectionException: Internal error: Failed to retrieve the default value in /.../vendor/symfony/dependency-injection/Compiler/AutowirePass.php:437
Stack trace:
#0 /.../vendor/symfony/dependency-injection/Compiler/AutowirePass.php(437): ReflectionParameter->getDefaultValue()
#1 /.../vendor/symfony/dependency-injection/Compiler/AutowirePass.php(80): Symfony\Component\DependencyInjection\Compiler\AutowirePass::getResourceMetadataForMethod(Object(ReflectionMethod))
#2 /.../vendor/symfony/dependency-injection/Compiler/AutowirePass.php(105): Symfony\Component\DependencyInjection\Compiler\AutowirePass::createResourceForClass(Object(ReflectionClass))
symfony#3 /.../vendor/symfony/dependency-injection/Compiler/AutowirePass.php(48): Symfony\Component\DependencyInjection\Compiler\AutowirePass->completeDefinition('__controller.Sw...', Object(Symfony\Component\DependencyInjection\Definition), Array)
symfony#4 /.../vendor/symfony/dependency-injection/Compiler/Compiler in /.../vendor/symfony/dependency-injection/Compiler/AutowirePass.php on line 437
```

**Example:**
```
<?php
class FooVariadic
{
    public function bar(...$arguments)
    {
    }
}

$method = new ReflectionMethod(FooVariadic::class, 'bar');
$parameter = $method->getParameters()[0];
$parameter->getDefaultValue(); // -> ReflectionException: Internal error: Failed to retrieve the default value in ...
```

Commits
-------

a7f63de [DependencyInjection] Fixed variadic method parameter in autowired classes

This PR was squashed before being merged into the 3.4 branch (closes symfony#34422).

Discussion
----------

Update HttpKernel.php

phpstan-symfony (0.11.6) level 5

Parameter #2 $values of method Symfony\Component\HttpFoundation\HeaderBag::set() expects array|string, int given.

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #... <!-- prefix each issue number with "Fix #", if any -->
| License       | MIT
| Doc PR        |

Commits
-------

7b7f966 Update HttpKernel.php