Revert "bug #17052 [2.7] Fixed flatten exception recursion with errors (GrahamCampbell)"

This reverts commit af3f4eaa2b37bca77274b670e96a695f3e46c4e5, reversing
changes made to 021ab8a7b35cac053442124e04cd87e2e1ef43cd.

composer.json

@@ -22,7 +22,6 @@
         "symfony/http-kernel": ">=2.3,<2.3.24|~2.4.0|>=2.5,<2.5.9|>=2.6,<2.6.2"
     },
     "require-dev": {
-        "symfony/phpunit-bridge": "~2.7",
         "symfony/http-kernel": "~2.3.24|~2.5.9|~2.6,>=2.6.2",
         "symfony/http-foundation": "~2.1"
     },
@@ -32,7 +31,10 @@
         "symfony/class-loader": ""
     },
     "autoload": {
-        "psr-0": { "Symfony\\Component\\Debug\\": "" }
+        "psr-0": { "Symfony\\Component\\Debug\\": "" },
+        "exclude-from-classmap": [
+            "/Tests/"
+        ]
     },
     "target-dir": "Symfony/Component/Debug",
     "minimum-stability": "dev",

phpunit.xml.dist

@@ -9,6 +9,7 @@
     <php>
         <ini name="error_reporting" value="-1" />
     </php>
+
     <testsuites>
         <testsuite name="Symfony Debug Component Test Suite">
             <directory>./Tests/</directory>