transformers

416711c3 - Fix 29807 sinusoidal positional encodings in Flaubert, Informer and XLM (#29904)

Fix 29807 sinusoidal positional encodings in Flaubert, Informer and XLM (#29904) * Fix sinusoidal_embeddings in FlaubertModel * Fix for Informer * Fix for XLM * Move sinusoidal emb for XLM * Move sinusoidal emb for Flaubert * Small cleanup * Add comments on tests code copied from * Add with Distilbert->