Use the vLLM IR RMSNorm op after the legacy layernorm helper was removed, keeping MoT fused paths unchanged while restoring BAGEL compatibility. Co-authored-by: Yufeng Zhu <yzhu802@gatech.edu> Co-authored-by: Cursor <cursoragent@cursor.com> Signed-off-by: princepride <wangzhipeng628@gmail.com>