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12004bf3 - [Community Pipelines]Accelerate inference of stable diffusion xl (SDXL) by IPEX on CPU (#6683)

[Community Pipelines]Accelerate inference of stable diffusion xl (SDXL) by IPEX on CPU (#6683) * add stable_diffusion_xl_ipex community pipeline * make style for code quality check * update docs as suggested --------- Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>