Inter-device communication

• RT codegen for non-primitive writes.
• Remove object device demands analysis.
• Unification-based method for assigning nodes to devices + repair by inserting constants and copies for inter-device communication.
• Add test that runs half on CPU and half on GPU.

requested review from @aaronjc4

assigned to @rarbore2

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• 9ff5f47d - fix

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• 780a0767 - fix write constraints

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• 5c44ea7d - Slots can be noresetconstant

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• b7f3dc8b - .

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• 532f5392 - fix

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merged

mentioned in commit aac0d0f3