repair coroutine delegation in await expressions (must pass through "gen->yieldfrom" check)

Cython/Utility/AsyncGen.c

@@ -495,7 +495,7 @@ __Pyx_async_gen_asend_send(__pyx_PyAsyncGenASend *o, PyObject *arg)
         o->ags_state = __PYX_AWAITABLE_STATE_ITER;
     }
 
-    result = __Pyx_Coroutine_SendEx((__pyx_CoroutineObject*)o->ags_gen, arg, 0);
+    result = __Pyx_Coroutine_Send((PyObject*)o->ags_gen, arg);
     result = __Pyx_async_gen_unwrap_value(o->ags_gen, result);
 
     if (result == NULL) {
@@ -839,7 +839,7 @@ __Pyx_async_gen_athrow_send(__pyx_PyAsyncGenAThrow *o, PyObject *arg)
 
     assert (o->agt_state == __PYX_AWAITABLE_STATE_ITER);
 
-    retval = __Pyx_Coroutine_SendEx((__pyx_CoroutineObject *)gen, arg, 0);
+    retval = __Pyx_Coroutine_Send((PyObject *)gen, arg);
     if (o->agt_args) {
         return __Pyx_async_gen_unwrap_value(o->agt_gen, retval);
     } else {

Cython/Utility/Coroutine.c

@@ -419,6 +419,9 @@ static PyTypeObject *__pyx_CoroutineAwaitType = 0;
 
 static int __pyx_Coroutine_init(void); /*proto*/
 static PyObject *__Pyx__Coroutine_await(PyObject *coroutine); /*proto*/
+static PyObject *__Pyx_Coroutine_Send(PyObject *self, PyObject *value); /*proto*/
+static PyObject *__Pyx_Coroutine_Close(PyObject *self); /*proto*/
+static PyObject *__Pyx_Coroutine_Throw(PyObject *gen, PyObject *args); /*proto*/
 
 
 //////////////////// Generator.proto ////////////////////
@@ -452,10 +455,6 @@ static int __pyx_Generator_init(void); /*proto*/
 #include <structmember.h>
 #include <frameobject.h>
 
-static PyObject *__Pyx_Coroutine_Send(PyObject *self, PyObject *value);
-static PyObject *__Pyx_Coroutine_Close(PyObject *self);
-static PyObject *__Pyx_Coroutine_Throw(PyObject *gen, PyObject *args);
-
 #define __Pyx_Coroutine_Undelegate(gen) Py_CLEAR((gen)->yieldfrom)
 
 //   If StopIteration exception is set, fetches its 'value'