Break down TO_BOOL_STR into guard and to-bool

Author: fluhus

Include/internal/pycore_opcode_metadata.h

@@ -512,10 +512,14 @@ dummy_func(
             res = PyStackRef_False;
         }
 
-        inst(TO_BOOL_STR, (unused/1, unused/2, value -- res)) {
+        op(_GUARD_TOS_UNICODE, (value-- value)) {
             PyObject *value_o = PyStackRef_AsPyObjectBorrow(value);
             EXIT_IF(!PyUnicode_CheckExact(value_o));
+        }
+
+        op(_TO_BOOL_STR, (value-- res)) {
             STAT_INC(TO_BOOL, hit);
+            PyObject* value_o = PyStackRef_AsPyObjectBorrow(value);
             if (value_o == &_Py_STR(empty)) {
                 assert(_Py_IsImmortal(value_o));
                 DEAD(value);
@@ -528,6 +532,9 @@ dummy_func(
             }
         }
 
+        macro(TO_BOOL_STR) =
+            _GUARD_TOS_UNICODE + unused / 1 + unused / 2 + _TO_BOOL_STR;
+
         op(_REPLACE_WITH_TRUE, (value -- res)) {
             PyStackRef_CLOSE(value);
             res = PyStackRef_True;