Describe the bug
no output when set --low-bit to sym_int8, mixed_fp8,fp4.
set sym_int4 work.

How to reproduce
Steps to reproduce the error:

1. build conda environment :

 conda create -n llm python=3.11
conda activate llm   
pip install --pre --upgrade ipex-llm[xpu] --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/us/ 
conda install pkg-config libuv
python -m pip install torch==2.1.0a0 torchvision==0.16.0a0 torchaudio==2.1.0a0 intel-extension-for-pytorch==2.1.10 --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/cn/

2. infer:
   python ./transformers_low_bit_pipeline.py --repo-id-or-model-path D:\StreamingMedia\model\LLM\Qwen2-1.5B-Instruct --low-bit sym_int8

Screenshots
sym_int4 output:

sym_int8 output:

when i debug, the code is break in \ipex_llm\transformers\low_bit_linear.py:
result = xe_linear.forward_new(x_2d, w, self.qtype, self.out_len)

transformers_low_bit_pipeline.py code is from transformers_low_bit_pipeline.py