[Debug] fixes ClassNotFoundFatalErrorHandler to correctly handle class not found errors with Symfony ClassLoader component autoloaders.
bug #13173 [Debug] fixes ClassNotFoundFatalErrorHandler to correctly handle class not found errors with Symfony ClassLoader component autoloaders. (hhamon)

This PR was merged into the 2.5 branch.

Discussion
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[Debug] fixes ClassNotFoundFatalErrorHandler to correctly handle class not found errors with Symfony ClassLoader component autoloaders.

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

Commits
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008f2ea [Debug] fixes ClassNotFoundFatalErrorHandler to correctly handle class not found errors with Symfony ClassLoader component autoloaders.