Move the initialization of some pointers earlier. The problem is

that if we call Py_DECREF(frame) like we do if allocating locals fails,
frame_dealloc() will try to use these bogus values and crash.

Objects/frameobject.c

@@ -642,6 +642,7 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
 		f->f_trace = NULL;
                 f->f_exc_type = f->f_exc_value = f->f_exc_traceback = NULL;
 	}
+	f->f_stacktop = f->f_valuestack;
 	f->f_builtins = builtins;
 	Py_XINCREF(back);
 	f->f_back = back;
@@ -672,7 +673,6 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
 	f->f_lineno = code->co_firstlineno;
 	f->f_iblock = 0;
 
-        f->f_stacktop = f->f_valuestack;
 	_PyObject_GC_TRACK(f);
 	return f;
 }