bug symfony#25285 [DI] Throw an exception if Expression Language is not installed (sroze)

This PR was merged into the 3.4 branch.

Discussion
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[DI] Throw an exception if Expression Language is not installed

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#25277
| License       | MIT
| Doc PR        | ø

The [`PhpDumper` already has this check](https://github.com/symfony/symfony/blob/master/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php#L1688-L1690) but it is missing here.

Commits
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75b21e9 Throw an exception is expression language is not installed

Author: nicolas-grekas

src/Symfony/Component/DependencyInjection/Compiler/AnalyzeServiceReferencesPass.php

@@ -14,6 +14,7 @@
 use Symfony\Component\DependencyInjection\Argument\ArgumentInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 use Symfony\Component\DependencyInjection\ExpressionLanguage;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
@@ -155,6 +156,10 @@ private function getDefinitionId($id)
     private function getExpressionLanguage()
     {
         if (null === $this->expressionLanguage) {
+            if (!class_exists(ExpressionLanguage::class)) {
+                throw new RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
+            }
+
             $providers = $this->container->getExpressionLanguageProviders();
             $this->expressionLanguage = new ExpressionLanguage(null, $providers, function ($arg) {
                 if ('""' === substr_replace($arg, '', 1, -1)) {