Cleanup of some exception code

Decision is **carefully** vet scenarios where we need to throw an
exception with extra data, and create custom exceptions for those cases.

src/Microsoft.AspNet.Mvc.Core/MvcRouteHandler.cs

@@ -103,14 +103,9 @@ namespace Microsoft.AspNet.Mvc
             {
                 LogActionSelection(actionSelected: true, actionInvoked: false, handled: context.IsHandled);
 
-                var ex = new InvalidOperationException(
+                throw new InvalidOperationException(
                     Resources.FormatActionInvokerFactory_CouldNotCreateInvoker(
                         actionDescriptor.DisplayName));
-
-                // Add tracing/logging (what do we think of this pattern of
-                // tacking on extra data on the exception?)
-                ex.Data.Add("AD", actionDescriptor);
-                throw ex;
             }
 
             await invoker.InvokeAsync();