[Bugfix] Support compile for Transformers multimodal (#23095)

Signed-off-by: raushan <raushan@huggingface.co>

vllm/model_executor/models/transformers.py

@@ -709,6 +709,13 @@ def flatten_and_concat(x: list[torch.Tensor]) -> torch.Tensor:
     MultiModalProcessor,
     info=MultiModalProcessingInfo,
     dummy_inputs=MultiModalDummyInputsBuilder)
+@support_torch_compile(
+    dynamic_arg_dims={
+        "input_ids": 0,
+        "positions": -1,
+        "intermediate_tensors": 0,
+        "inputs_embeds": 0,
+    })  # set `positions` to last dim to support Qwen-mrope
 class TransformersForMultimodalLM(TransformersForCausalLM, SupportsMultiModal):
     # Backwards compatibility for prev released models. State dicts back then
     # had different formats and cannot be loaded with `AutoModel` mapping as is