Add optional arguments to NullPointerException so that it can report more information (make it simi…

runtime/lib/object.cc

Index: runtime/lib/object.cc
===================================================================
--- runtime/lib/object.cc	(revision 6423)
+++ runtime/lib/object.cc	(working copy)
@@ -19,16 +19,19 @@
 
 DEFINE_NATIVE_ENTRY(Object_noSuchMethod, 3) {
   const Instance& instance = Instance::CheckedHandle(arguments->At(0));
+  GET_NATIVE_ARGUMENT(String, function_name, arguments->At(1));
+  GET_NATIVE_ARGUMENT(Array, func_args, arguments->At(2));
   if (instance.IsNull()) {
     GrowableArray<const Object*> args;
+    args.Add(&function_name);
+    args.Add(&func_args);
     Exceptions::ThrowByType(Exceptions::kNullPointer, args);
   }
-  GET_NATIVE_ARGUMENT(String, function_name, arguments->At(1));
-  GET_NATIVE_ARGUMENT(Array, func_args, arguments->At(2));
   GrowableArray<const Object*> dart_arguments(3);
   dart_arguments.Add(&instance);
   dart_arguments.Add(&function_name);
   dart_arguments.Add(&func_args);
+
   // Report if a function with same name (but different arguments) has been
   // found.
   Class& instance_class = Class::Handle(instance.clazz());