[Kunlunxin] 昆仑芯XPU 使用flagtree 编译Triton Attention 后端报错了

flagtree 编译 vllm 0.20.0 的 triton attention 后端报错了
复现环境
- 镜像: 使用flagtree xpu 3.6 镜像安装vllm 0.20.0 即可。可以把TRITON_ATTN 对应的 triton kernel 拿出来验证一下。

详细日志如下:
[昆仑芯用flagtree 编译TRITON_ATTN后端报错.txt](https://github.com/user-attachments/files/30774319/flagtree.TRITON_ATTN.txt)

Start by reproducing the failure in the FlagTree XPU 3.6 image with vLLM 0.20.0, then read the attached log and isolate the TRITON_ATTN Triton kernel as suggested. Done means the TRITON_ATTN backend compiles successfully in that environment without the reported error.

Written by the indexing model from the issue text.