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867e0c91 - StableDiffusionLatentUpscalePipeline - positive/negative prompt embeds support (#8947)

StableDiffusionLatentUpscalePipeline - positive/negative prompt embeds support (#8947) * make latent upscaler accept prompt embeds --------- Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com> Co-authored-by: Sayak Paul <spsayakpaul@gmail.com> Co-authored-by: YiYi Xu <yixu310@gmail.com>