Back out "Revert D92315076: [CinderX] Fix JIT descriptor leak"

Summary:
This was reverted but it looks like  D91839270  is the underlying cause. See successful canaries in the test plan for D93795189.

Another Claude find, and it's true. You can see in the error case the ref isn't closed: https://www.internalfb.com/code/fbsource/[9d30d92ea5b14652a06282272846963473638d19]/third-party/python/main/patched/Objects/typeobject.c?lines=2978

Original commit changeset: 13b585cadd56

Original Phabricator Diff: D92315076

Reviewed By: alexmalyshev

Differential Revision: D93795189

fbshipit-source-id: 3c1354c1579e7187984a143f69e1cc2431cdac28

Author: DinoV

cinderx/Jit/jit_rt.cpp

@@ -2189,7 +2189,10 @@ LoadMethodResult JITRT_LoadSpecial(
   int err = _PyObject_LookupSpecialMethod(name, method_and_self);
   if (err <= 0) {
     PyStackRef_CLOSE(method_and_self[1]);
-    if (err == 0) {
+    if (err < 0) {
+      // When __get__ raises, method_and_self[0] holds a ref to the descriptor
+      PyStackRef_XCLOSE(method_and_self[0]);
+    } else if (err == 0) {
       PyObject* owner = PyStackRef_AsPyObjectBorrow(method_and_self[1]);
       const char* errfmt = _PyEval_SpecialMethodCanSuggest(owner, special_idx)
           ? _Py_SpecialMethods[special_idx].error_suggestion