trunk/725d0e7d7ce911862327c609493f7f862cfeabcb: Respect the blocking parameter in torch.Event (#189017)

发生了什么

Motivation This issue was discovered in vllm-project/vllm#47081 . Previously, torch.Event accepted the blocking parameter but ignored it. This PR makes torch.Event honor the blocking parameter, reducing the behavioral gap between torch.Event and torch.cuda.Event . Pull Request resolved: #189017 Approved by: https://github.com/EikanWang , https://github.com/gujinghui , https://github.com/albanD , https://github.com/f…

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