[BUG] Reorder model config creation (vllm-project#26124)

Signed-off-by: ahao-anyscale <ahao@anyscale.com>

Author: ahao-anyscale

vllm/engine/arg_utils.py

@@ -1131,6 +1131,10 @@ def create_engine_config(
  device_config = DeviceConfig(
  device=cast(Device, current_platform.device_type))
 
+ model_config = self.create_model_config()
+ self.model = model_config.model
+ self.tokenizer = model_config.tokenizer
+
  (self.model, self.tokenizer,
  self.speculative_config) = maybe_override_with_speculators(
  model=self.model,
@@ -1139,7 +1143,6 @@ def create_engine_config(
  trust_remote_code=self.trust_remote_code,
  vllm_speculative_config=self.speculative_config,
  )
- model_config = self.create_model_config()
 
  # * If VLLM_USE_V1 is unset, we enable V1 for "supported features"
  # and fall back to V0 for experimental or unsupported features.