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>