bug #18765 Catch \Throwable (fprochazka)

This PR was merged into the 2.8 branch.

Discussion
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Catch \Throwable

| Q             | A
| ------------- | ---
| Branch?       | 2.8, 3.0
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | Mostly!
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

The first commit is based on symfony/symfony#15949
Depends on symfony/symfony#18813, symfony/symfony#18812

----

I'm new to symfony, so I'm not sure where are all the places where it makes sense to actually catch the throwable and where not. I added most places that seemed logical and when I wasn't sure, I added it anyway. I'm hoping you guys (and girls?) can point out the places where the catch should not be added, I'll fix it and then I can create several PR's for the older branches. A lot of this IMHO should go also to 3.0.

Commits
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de671f4 Catch \Throwable

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

@@ -44,8 +44,8 @@ class AutowirePass implements CompilerPassInterface
                     $this->completeDefinition($id, $definition);
                 }
             }
-        } catch (\Error $e) {
         } catch (\Exception $e) {
+        } catch (\Throwable $e) {
         }
 
         spl_autoload_unregister($throwingAutoloader);