Update GroupInfo.json

Author: kastiglione

stdlib/public/core/GroupInfo.json

@@ -161,7 +161,8 @@
     "Mirror.swift",
     "Mirrors.swift",
     "ReflectionMirror.swift",
-    "ObjectIdentifier.swift"
+    "ObjectIdentifier.swift",
+    "ObjectIdentifier+DebugDescription.swift"
   ],
   "Math": [
     "SetAlgebra.swift",