fix IndexError when runners list changes dynamically

Signed-off-by: Shijie Wang <[email protected]>

Author: Wong4j

tensorrt_llm/_torch/autotuner.py

@@ -350,11 +350,14 @@ def search_cache(
         Returns:
             A tuple containing:
             [is_cache_hit, runner_id, tactic, stored_profile]
+            runner_id is the index in the current runners list
         """
-        for r in runners:
+        for idx, r in enumerate(runners):
             if (cache_key := self.get_cache_key(custom_op, r, input_shapes,
                                                 tuning_config)) in self.cache:
-                return True, *self.cache[cache_key]
+                # Return the current index in runners list, not the cached runner_id
+                cached_runner_id, tactic, min_time = self.cache[cache_key]
+                return True, idx, tactic, min_time
 
         return False, *self.fallback_entry()