Call Py_Is function on GraalPy

Author: timfel

newsfragments/5121.changed.md

@@ -1 +1,2 @@
 Enable vectorcall methods on GraalPy
+Call Py_Is function on GraalPy

pyo3-ffi/src/object.rs

@@ -147,13 +147,13 @@ pub struct PyVarObject {
 // skipped private _PyVarObject_CAST
 
 #[inline]
-#[cfg(not(all(PyPy, Py_3_10)))]
+#[cfg(not(any(GraalPy, all(PyPy, Py_3_10))))]
 #[cfg_attr(docsrs, doc(cfg(all())))]
 pub unsafe fn Py_Is(x: *mut PyObject, y: *mut PyObject) -> c_int {
     (x == y).into()
 }
 
-#[cfg(all(PyPy, Py_3_10))]
+#[cfg(any(GraalPy, all(PyPy, Py_3_10)))]
 #[cfg_attr(docsrs, doc(cfg(all())))]
 extern "C" {
     #[cfg_attr(PyPy, link_name = "PyPy_Is")]