[SYSTEMDS-3362] CUDA code gen stream bugfix#1600
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This change pulls in the latest commits from upstream jitify. This includes a local fix of an ignored PR that was eventually fixed by someone else.
The CUDA code generation launcher handles streams per operator at the moment. This is wrong since a read before write can happen on a certain device allocation. Switching to a central stream object for now. Closes apache#1600
Code gen native support compiled on Ubuntu 20 LTS/CUDA-10.2
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