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9d061618 - Slight performance improvement to `Euler`, `EDMEuler`, `FlowMatchHeun`, `KDPM2Ancestral` (#9616)

Slight performance improvement to `Euler`, `EDMEuler`, `FlowMatchHeun`, `KDPM2Ancestral` (#9616) * Slight performance improvement to Euler * Slight performance improvement to EDMEuler * Slight performance improvement to FlowMatchHeun * Slight performance improvement to KDPM2Ancestral * Update KDPM2AncestralDiscreteSchedulerTest --------- Co-authored-by: YiYi Xu <yixu310@gmail.com>