[ROCm] Fix TurboQuant on ROCm: backend routing, flash-attn compat, int64 overflow#39953

vllm-bot merged 2 commits intovllm-project:mainvllm-project/vllm:mainfrom

aditi-amd:feat/tq-rocm-withfixaditi-amd/vllm:feat/tq-rocm-withfixCopy head branch name to clipboard