等待每个请求完成。
如果在此调用后对任何请求调用 AsyncGPUReadbackRequest.done，则无论请求是否已成功完成，都始终返回 true。
AsyncGPUReadbackRequest.hasError 可用于确定请求是否已成功完成。
WaitAllRequests 停止 GPU 和 CPU。这意味着，调用此函数会大幅降低性能。因此，应谨慎使用此函数。
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