Move type assignment from _TO_BOOL_STR to _GUARD_TOS_UNICODE

Author: fluhus

Python/optimizer_bytecodes.c

@@ -418,12 +418,12 @@ dummy_func(void) {
         if (sym_matches_type(value, &PyUnicode_Type)) {
             REPLACE_OP(this_instr, _NOP, 0, 0);
         }
+        sym_set_type(value, &PyUnicode_Type);
     }
 
     op(_TO_BOOL_STR, (value -- res)) {
         if (!optimize_to_bool(this_instr, ctx, value, &res)) {
             res = sym_new_truthiness(ctx, value, true);
-            sym_set_type(value, &PyUnicode_Type);
         }
     }