[Model Runner V2] Don't use UVA buffer for prefill_len #29713
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Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
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This pull request addresses a potential race condition related to the prefill_len buffer. By replacing the UvaBuffer with a CpuGpuBuffer and adding an explicit copy_to_gpu call, the change ensures that updates to prefill_len on the CPU are safely synchronized to the GPU before being used in subsequent kernels. The implementation is correct and effectively mitigates the risk of reading stale data on the GPU. This is a good correctness improvement.
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