Add _STORE_ATTR_SLOT to optimizer bytecodes

Author: savannahostrowski

Lib/test/test_capi/test_opt.py

@@ -2533,7 +2533,7 @@ def testfunc(n):
         self.assertIsNotNone(ex)
         uops = get_opnames(ex)
         self.assertIn("_STORE_ATTR_SLOT", uops)
-        self.assertIn("_POP_TOP", uops)
+        self.assertIn("_POP_TOP_NOP", uops)
 
     def test_attr_promotion_failure(self):
         # We're not testing for any specific uops here, just

Python/optimizer_bytecodes.c

@@ -109,6 +109,12 @@ dummy_func(void) {
         ss = sub_st;
     }
 
+    op(_STORE_ATTR_SLOT, (index/1, value, owner -- o)) {
+        (void)index;
+        (void)value;
+        o = owner;
+    }
+
     op(_PUSH_NULL, (-- res)) {
         res = sym_new_null(ctx);
     }