[Transformers] Generalize merged-column linear fusion (#55301)
Signed-off-by: BANANASJIM <bananasjim1@gmail.com>
Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
