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d54669a7 - [Qwen] avoid creating attention masks when there is no padding (#12987)

[Qwen] avoid creating attention masks when there is no padding (#12987) * avoid creating attention masks when there is no padding * make fix-copies * torch compile tests * set all ones mask to none * fix positional encoding from becoming > 4096 * fix from review * slice freqs_cis to match the input sequence length * keep only attenton masking change --------- Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>