Implement C API function PyMethodDescr_Check

Author: fangerer

graalpython/com.oracle.graal.python.cext/src/descrobject.c

@@ -61,3 +61,7 @@ PyObject* PyDictProxy_New(PyObject *mapping) {
     return (PyObject*) UPCALL_CEXT_O(_jls_PyDictProxy_New, native_to_java(mapping));
 }
 
+UPCALL_ID(PyMethodDescr_Check);
+int PyMethodDescr_Check(PyObject* method) {
+    return UPCALL_CEXT_I(_jls_PyMethodDescr_Check, native_to_java(method));
+}

graalpython/lib-graalpython/python_cext.py

@@ -966,6 +966,10 @@ def bound_function(*args, **kwargs):
     return bound_function
 
 
+def PyMethodDescr_Check(func):
+    return 1 if isinstance(func, type(list.append)) else 0
+
+
 # corresponds to PyInstanceMethod_Type
 class instancemethod:
     def __init__(self, func):