optimize jit attribute loads on immutable types

Author: kumaraditya303

Python/optimizer_analysis.c

@@ -367,7 +367,10 @@ lookup_attr(JitOptContext *ctx, _PyBloomFilter *dependencies, _PyUOpInstruction
     if (type && PyType_Check(type)) {
         PyObject *lookup = _PyType_Lookup(type, name);
         if (lookup) {
-            int opcode = _Py_IsImmortal(lookup) ? immortal : mortal;
+            int opcode = mortal;
+            if (_Py_IsImmortal(lookup) || (type->tp_flags & Py_TPFLAGS_IMMUTABLETYPE)) {
+                opcode = immortal;
+            }
             ADD_OP(opcode, 0, (uintptr_t)lookup);
             PyType_Watch(TYPE_WATCHER_ID, (PyObject *)type);
             _Py_BloomFilter_Add(dependencies, type);