optimise call to asyncio "firstiter" method for async generators

Cython/Utility/AsyncGen.c

@@ -100,6 +100,7 @@ static int __Pyx_async_gen_init_hooks(__pyx_PyAsyncGenObject *o) {
 //////////////////// AsyncGenerator ////////////////////
 //@requires: AsyncGeneratorInitFinalizer
 //@requires: Coroutine.c::Coroutine
+//@requires: ObjectHandling.c::PyObjectCallMethod1
 
 
 PyDoc_STRVAR(__Pyx_async_gen_send_doc,
@@ -222,7 +223,8 @@ __Pyx_async_gen_init_hooks(__pyx_PyAsyncGenObject *o)
         PyObject *res;
 
         Py_INCREF(firstiter);
-        res = __Pyx_PyObject_CallOneArg(firstiter, (PyObject*)o);
+        // at least asyncio stores methods here => optimise the call
+        res = __Pyx__PyObject_CallMethod1(firstiter, (PyObject*)o);
         Py_DECREF(firstiter);
         if (unlikely(res == NULL)) {
             return 1;

Cython/Utility/ObjectHandling.c

@@ -1268,6 +1268,7 @@ bad:
 /////////////// PyObjectCallMethod1.proto ///////////////
 
 static PyObject* __Pyx_PyObject_CallMethod1(PyObject* obj, PyObject* method_name, PyObject* arg); /*proto*/
+static PyObject* __Pyx__PyObject_CallMethod1(PyObject* method, PyObject* arg); /*proto*/
 
 /////////////// PyObjectCallMethod1 ///////////////
 //@requires: PyObjectGetAttrStr
@@ -1275,10 +1276,8 @@ static PyObject* __Pyx_PyObject_CallMethod1(PyObject* obj, PyObject* method_name
 //@requires: PyFunctionFastCall
 //@requires: PyCFunctionFastCall
 
-static PyObject* __Pyx_PyObject_CallMethod1(PyObject* obj, PyObject* method_name, PyObject* arg) {
-    PyObject *method, *result = NULL;
-    method = __Pyx_PyObject_GetAttrStr(obj, method_name);
-    if (unlikely(!method)) goto done;
+static PyObject* __Pyx__PyObject_CallMethod1(PyObject* method, PyObject* arg) {
+    PyObject *result;
 #if CYTHON_UNPACK_METHODS
     if (likely(PyMethod_Check(method))) {
         PyObject *self = PyMethod_GET_SELF(method);
@@ -1315,6 +1314,15 @@ static PyObject* __Pyx_PyObject_CallMethod1(PyObject* obj, PyObject* method_name
     }
 #endif
     result = __Pyx_PyObject_CallOneArg(method, arg);
+done:
+    return result;
+}
+
+static PyObject* __Pyx_PyObject_CallMethod1(PyObject* obj, PyObject* method_name, PyObject* arg) {
+    PyObject *method, *result;
+    method = __Pyx_PyObject_GetAttrStr(obj, method_name);
+    if (unlikely(!method)) goto done;
+    result = __Pyx__PyObject_CallMethod1(method, arg);
 done:
     Py_XDECREF(method);
     return result;