remove check for optim_cache_dir in trt slim int8 (#32676) (#33629)

Author: Pei Yang

paddle/fluid/inference/analysis/ir_pass_manager.cc

@@ -106,8 +106,8 @@ void IRPassManager::CreatePasses(Argument *argument,
       bool use_static_engine = argument->tensorrt_use_static_engine();
       bool model_from_memory = argument->model_from_memory();
       std::string optim_cache_dir = argument->optim_cache_dir();
-      bool int8_valid =
-          !(model_from_memory && optim_cache_dir.empty() && enable_int8);
+      bool int8_valid = !(model_from_memory && optim_cache_dir.empty() &&
+                          enable_int8 && use_calib_mode);
       PADDLE_ENFORCE_EQ(
           int8_valid, true,
           platform::errors::PreconditionNotMet(