Convert BoxedMethodDescriptor call_internal to tppCall

Minor, but should cut down on some overhead

src/runtime/types.h

@@ -927,8 +927,8 @@ public:
 
     static Box* __get__(BoxedMethodDescriptor* self, Box* inst, Box* owner);
     static Box* __call__(BoxedMethodDescriptor* self, Box* obj, BoxedTuple* varargs, Box** _args);
-    static Box* callInternal(BoxedFunctionBase* f, CallRewriteArgs* rewrite_args, ArgPassSpec argspec, Box* arg1,
-                             Box* arg2, Box* arg3, Box** args, const std::vector<BoxedString*>* keyword_names);
+    static Box* tppCall(Box* _self, CallRewriteArgs* rewrite_args, ArgPassSpec argspec, Box* arg1, Box* arg2, Box* arg3,
+                        Box** args, const std::vector<BoxedString*>* keyword_names);
     static void gcHandler(GCVisitor* v, Box* _o);
 };