[`Mixtral` / `Awq`] Add mixtral fused modules for Awq (#28240)
* add mixtral fused modules
* add changes from modeling utils
* add test
* fix test + rope theta issue
* Update src/transformers/modeling_utils.py
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>
* add tests
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Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>