Switch to device-centric synchronization for forEach mGPU#440
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Signed-off-by: Matthew Cong <mcong@nvidia.com>
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harrism
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Before device-centric synchronization was introduced for mGPU we needed to sync all of the device streams with the host. Now, we can just call
mergeStreamsinstead (just like we do in the Gaussian splatting code) in order to perform this synchronization fully on the device side.